Callosobruchus maculatus (cowpea weevil)
- Taxonomic Tree
- Notes on Taxonomy and Nomenclature
- Distribution Table
- Habitat List
- Hosts/Species Affected
- Host Plants and Other Plants Affected
- Growth Stages
- List of Symptoms/Signs
- Biology and Ecology
- Natural enemies
- Notes on Natural Enemies
- Detection and Inspection
- Prevention and Control
- Links to Websites
- Distribution Maps
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PicturesTop of page
IdentityTop of page
Preferred Scientific Name
- Callosobruchus maculatus (Fabricius, 1775)
Preferred Common Name
- cowpea weevil
Other Scientific Names
- Bruchus ambiguus Gyllenhal 1839
- Bruchus maculatus Fabricius 1775
- Bruchus ornatus Boheman
- Bruchus quadrimaculatus Fabricius 1792
- Bruchus sinuatus Fåhraeus
- Bruchus trabuti (Caillol)
- Bruchus vicinus Gyllenhal 1833
- Callosobruchus ambiguus (Gyllenhal)
- Callosobruchus ornatus (Boheman 1829)
- Callosobruchus quadrimaculatus (Fabricius)
- Callosobruchus sinuatus (Fåhraeus)
- Callosobruchus vicinus (Gyllenhal)
- Mylabris quadrimaculatus (Fabricius)
- Pachymerus quadrimaculatus (Fabricius 1905)
- Pseudopachymerus quadrimaculatus (Fabricius)
International Common Names
- English: cowpea seed beetle; four-spotted bean weevil; southern cowpea weevil; spotted cowpea bruchid
- Spanish: bruquido del chícharo de vaca; coquito de las caraotas almacenadas; gorgojo de cuatro manchas; gorgojo del caupí; picudo del caupi
- French: bruche a quatre taches; bruchide
- Portuguese: caruncho do feijao de corda
Local Common Names
- Germany: vierfleckiger bohnen-kaefer; vierfleckiger kunde-kaefer
- Israel: hazaryit hamuchtemet
- Italy: tonchio del ceci
- Turkey: borulce tohum bocegi
- CALSMA (Callosobruchus maculatus)
- CALSOR (Callosobruchus ornatus)
Taxonomic TreeTop of page
- Domain: Eukaryota
- Kingdom: Metazoa
- Phylum: Arthropoda
- Subphylum: Uniramia
- Class: Insecta
- Order: Coleoptera
- Family: Bruchidae
- Genus: Callosobruchus
- Species: Callosobruchus maculatus
Notes on Taxonomy and NomenclatureTop of page
There are a number of species of Callosobruchus that may be found attacking pulses, of which the most common and well known is C. maculatus. Adults of most species known from stored pulses may be identified using the bruchid key in Haines (1991).
Southgate et al. (1957) listed many synonyms of C. maculatus; the only synonym that has been used commonly in the general literature, however, is Bruchus quadrimaculatus Fabricius. Some records of C. maculatus from South Africa may represent misidentifications of C. rhodesianus.
Systematic studies of species of Callosobruchus, Acanthoscelides and Bruchus from Central Anatolia in Turkey were reported by Mergen and Cagatay (1996).
DescriptionTop of page
The eggs are cemented to the surface of pulses and are smooth, domed structures with oval, flat bases.
Larva and Pupa
The larvae and pupae are normally only found in cells bored within the seeds of pulses. For descriptions and a key including C. maculatus larvae, see Prevett (1971) and Vats (1974).
C. maculatus adults are 2.0-3.5 mm long. The antennae of both sexes are slightly serrate (for details of antennal and sensilla structure see Mbata et al. (1997)). Females often have strong markings on the elytra consisting of two large lateral dark patches mid-way along the elytra and smaller patches at the anterior and posterior ends, leaving a paler brown cross-shaped area covering the rest. The males are much less distinctly marked. In common with other species of Callosobruchus, C. maculatus has a pair of distinct ridges (inner and outer) on the ventral side of each hind femur, and each ridge bears a tooth near the apical end. The inner tooth is triangular, and equal to (or slightly longer than) the outer tooth. A unique chordotonal structure in the fore coxae of adult C. maculatus and C. subinnotatus was described by Ramaswamy and Monroe (1997). The location and ultrastructure of sex pheromone glands in female C. maculatus is described by Pierre et al. (1996).
Several workers have described an active- or flight-form of adult C. maculatus which is apparently more active and is more strongly marked, with a white pygidium (Utida, 1953). The function of this form, which appears in populations as a result of genetic and environmental factors, is not understood.
DistributionTop of page
The two most widespread species of bruchid beetle are C. maculatus and C. chinensis, which are distributed throughout the tropics and sub-tropics. C. maculatus originated in Africa where it remains dominant.
Distribution TableTop of page
The distribution in this summary table is based on all the information available. When several references are cited, they may give conflicting information on the status. Further details may be available for individual references in the Distribution Table Details section which can be selected by going to Generate Report.
|Continent/Country/Region||Distribution||Last Reported||Origin||First Reported||Invasive||Reference||Notes|
|India||Widespread||Vir and Jindal, 1981|
|-Gujarat||Present||Chitra and Sinha, 2008|
|-Haryana||Present||Chitra and Sinha, 2008|
|-Indian Punjab||Present||Chitra and Sinha, 2008|
|-Odisha||Present||Sahoo and Behera, 2001|
|-Uttar Pradesh||Present||Chitra and Sinha, 2008|
|Pakistan||Widespread||Sulehrie et al., 1998|
|Sri Lanka||Widespread||Haines, 1981|
|Taiwan||Widespread||Rose et al., 1978|
|Turkey||Present||Mergen and Cagatay, 1996|
|Benin||Present||Kossou et al., 2001|
|Burkina Faso||Widespread||Ouedraogo et al., 1996|
|Cameroon||Present||Ngamo et al., 2007|
|Kenya||Widespread||Khamala, 1978; Olubayo and Port, 1997|
|Mali||Present||Introduced||Yusuf et al., 2011|
|Niger||Present||Ndoutoume et al., 2000|
|Sierra Leone||Widespread||Taylor, 1978|
|Togo||Present||Amevoin et al., 2005|
|Canada||Present||Majka and Langor, 2011||Atlantic Canada|
|USA||Restricted distribution||Aitken, 1975|
Central America and Caribbean
|Brazil||Widespread||Credland and Dick, 1987|
|Germany||Present||Schöller and Heinig, 2000|
Habitat ListTop of page
Hosts/Species AffectedTop of page
C. maculatus is a major pest of cowpeas, green gram and lentils. For a complete list of host plants, see Udayagiri and Wadhi (1989), and Desroches et al. (1997). Host plants vary considerably in their suitability for larval development (Wijeratne, 1998). Alpha-amylase inhibitors prevent development of C. maculatus on a number of legumes (Blanco-Labra et al., 1996; Reis et al., 1997; Ishimoto et al., 1999; Janarthanan et al., 1999) including Phaseolus vulgaris, but not the development of the bruchids Acanthoscelides obtectus and Zabrotes subfasciatus (Ishimoto and Chrispeels, 1996).
There have been many studies of host preference in C. maculatus and its ability to adapt to using hosts less suitable for larval development, for example Huignard et al. (1996); Taheri (1996); Sulehrie et al. (1998). Inheritance of aspects of host plant choice were observed by Messina and Slade (1997).
Host Plants and Other Plants AffectedTop of page
|Acacia nilotica (gum arabic tree)||Fabaceae||Main|
|Astragalus cicer (Cicer milkvetch)||Fabaceae||Other|
|Cajanus cajan (pigeon pea)||Fabaceae||Main|
|Cicer arietinum (chickpea)||Fabaceae||Other|
|Fabaceae (leguminous plants)||Fabaceae||Main|
|Glycine max (soyabean)||Fabaceae||Main|
|Lablab purpureus (hyacinth bean)||Fabaceae||Other|
|Lathyrus sativus (grasspea)||Fabaceae||Other|
|Lens culinaris subsp. culinaris (lentil)||Fabaceae||Main|
|Lupinus albus (white lupine)||Fabaceae||Other|
|Phaseolus acutifolius (tepary bean)||Fabaceae||Other|
|Pisum sativum (pea)||Fabaceae||Other|
|stored products (dried stored products)||Main|
|Vigna angularis (adzuki bean)||Fabaceae||Other|
|Vigna mungo (black gram)||Fabaceae||Other|
|Vigna radiata (mung bean)||Fabaceae||Main|
|Vigna umbellata (rice bean)||Fabaceae||Other|
|Vigna unguiculata (cowpea)||Fabaceae||Main|
|Vigna vexillata (wild sweetpea)||Fabaceae||Other|
|Voandzeia subterranea (bambara groundnut)||Fabaceae||Main|
Growth StagesTop of page Fruiting stage, Post-harvest
SymptomsTop of page In the early stages of attack the only symptoms are the presence of eggs cemented to the surface of the pulses. As development occurs entirely within the seed, the immature stages are not normally seen. The adults emerge through windows in the grain, leaving round holes that are the main evidence of damage.
List of Symptoms/SignsTop of page
|Seeds / internal feeding|
Biology and EcologyTop of page
The adult beetles, which do not feed on stored produce, are very short-lived, usually no more than 12 days under optimum conditions. During this time the females lay many eggs (C. maculatus up to 115, C. chinensis up to 70), although oviposition may be reduced in the presence of previously infested seeds (Parr et al., 1998a,b). Some adult females may have the ability to distinguish their own oviposition markers and appear to ignore the oviposition markers deposited by other females (Wijeratne and Smith, 1998). The optimum temperature for oviposition is high in C. maculatus, about 30-35°C and low in C. chinensis, 23°C. As the eggs are laid, they are firmly glued to the surface of the host seed, smooth-seeded varieties being more suitable for oviposition than rough-seeded varieties (Parr et al., 1996).
C. maculatus is easily raised in laboratories and has been used as a model organism in a number of ecological studies. Its development is strongly influenced by temperature and humidity (Xu, 1999), host substrate and population source (strain or biotype; Messina and Slade, 1999). A number of aspects of the behaviour of C. maculatus have been studied in some detail including: male mating behaviour (Giga and Canhao, 1997; Savalli and Fox, 1999; Wilson et al., 1999), investigating the effects of male size, multiple matings and interspecific interference on female fecundity; the decision making process undertaken by ovipositing females (Parr et al., 1996; 1998a; Horng et al., 1999); and the chemical ecology of host selection (Parr et al., 1998b).
The eggs are domed structures with oval, flat bases. When newly laid they are small, translucent grey and inconspicuous. Eggs hatch within 5-6 days of oviposition (Howe and Currie, 1964). Upon hatching, the larva bites through the base of the egg, through the testa of the seed and into the cotyledons. Detritus produced during this period is packed into the empty egg as the insect hatches, turning the egg white and making it clearly visible to the naked eye. When multiple conspecific eggs are laid on a single seed, larval competition may be evident (Horng, 1997).
The developing larva feeds entirely within a single seed, excavating a chamber as it grows. The optimum development conditions for C. maculatus and C. chinensis are around 32°C and 90% RH; the minimum development period for C. maculatus is about 21 days, and 22-23 days for C. chinensis. At 25°C and 70% RH the total development period of C. maculatus breeding on seeds of V. unguiculata is about 36 days, pupation taking place within the seed 26 days after oviposition (Howe and Currie, 1964). Relatively little is known about C. phaseoli although the optimum temperature for development is within the range 30-32.5°C (Howe and Currie, 1964).
Infestation commonly begins in the field, where eggs are laid on maturing pods (Prevett, 1961; Fatunla and Badaru, 1983; Messina, 1984; Fitzner et al., 1985). As the pods dry, the pest's ability to infest them decreases. Thus dry seeds stored in their pods are quite resistant to attack, whereas the threshed seeds are susceptible to attack throughout storage.
Natural enemiesTop of page
|Natural enemy||Type||Life stages||Specificity||References||Biological control in||Biological control on|
Notes on Natural EnemiesTop of page
The parasitic wasps Dinarmus spp., Eupelmus spp., Uscana spp., Lariophagus distinguendus, Heterospilus prosopidis and Anisopteromalus calandrae have been associated with a number of Callosobruchus species. It is probable that several other wasps known to parasitize a wide range of Coleoptera, such as Theocolax elegans, will also use Callosobruchus species as hosts.
See Biological Control for further details.
ImpactTop of page
Callosobruchus spp. are important pests of pulses. Infestation may start in the pods before harvest and carry over into storage where substantial losses may occur. In Nigeria, it has been estimated that 3% of the annual production in 1961/62 was lost due to attack by C. maculatus.
Levels of infestation in storage are strongly influenced by the type of storage structure employed and the variety of seed (Ojimelukwe et al., 1999). Storage structures that maintain high levels of moisture in seeds are more prone to high levels of infestation (Singh, 1999). Temperature of storage also influences levels of infestations in local stores (Singh, 1997).
The values of dried pulses are strongly influenced by levels of bruchid infestation in local markets, particularly in Sub-Saharan Africa.
Detection and InspectionTop of page
No particular detection or inspection methods for Callosobruchus spp. have been developed.
The potential exists for the development of population monitoring by use of sex pheromones. The female-produced sex pheromone has been isolated and identified (Phillips et al., 1996); and the behavioural and electroantennogram (EAG) response to pheremonal components by males was recorded by Shu et al. (1996).
Prevention and ControlTop of page
Due to the variable regulations around (de)registration of pesticides, your national list of registered pesticides or relevant authority should be consulted to determine which products are legally allowed for use in your country when considering chemical control. Pesticides should always be used in a lawful manner, consistent with the product's label.
Callosobruchus spp. may be controlled by fumigation treatment with phosphine, although legislation in many regions now frequently prohibits or restricts the use of these products. Controlled atmospheres of carbon dioxide can provide complete control of C. maculatus and C. subinnotatus (Mbata et al., 1996), and sealed or hermetic storage affords some protection against C. maculatus and C. chinensis (Seck et al., 1996; Singh and Yadav, 1996).
Approved grain insecticides, especially organophosphates, will protect against this pest (Lienard and Mignon, 1997; Rani, 1997; Ofuya and Lagunju, 1998).
When grain pulses are stored at farm level the admixture of vegetable oil or essential oils including citrus peel oil can give protection (Don-Pedro, 1989; Don-Pedro, 1996; Rajapakse et al., 1997; Rajapakse and Rathnasekera, 1998), as can the admixture of dessicant dusts or ash (Apuuli et al., 1996; Mohamed, 1996; Sharshir, 1998; Appel, 1999), and certain aromatic leaves, fruits or plant extracts (Mohamed, 1997), many of which are traditionally used by subsistence farmers (Belmain et al., 1999), thereby reducing the need for, and risks associated with, the use of insecticides (Shaaya et al., 1997). The mode of action of these biologicals may be insecticidal or anti-ovipositional (Adedire and Lajide, 1999).
The list of plants and plant extracts shown to have insecticidal or anti-ovipositional effect against C. maculatus and other bruchid pests is very long (Hixing et al., 1998a, b), including for example: Aframomum melegueta (Adedire and Lajide, 1999); Aglaia elliptica (Prijono et al., 1997); Allium spp. (Adedire and Lajide, 1999); Annona spp. (Prijono et al., 1997; Aku, 1998); Bandeiraea simplicifolia (Zhu et al., 1996; Zhu-Salzman, 1998); Boscia senegalensis (Seck et al., 1996); Cassia spp. (Babu et al., 1999; Raja et al., 2000); Cinnamomum camphora (Dharmasena et al., 1998); Coleus aromaticus (Babu et al., 1999); Cymbopogon citratus (Dharmasena et al., 1998); Dennettia tripetala (Okonkwo and Okoye, 1996); Capsicum spp. (El-Lakwah, 1996; Gakuru and Foua, 1996); Citrus spp. (Onu and Sulyman, 1997; Dharmasena et al., 1998); Clerodendrum inerme (El-Lakwah et al., 1996); Cyperus rotundus (Adedire and Lajide, 1999); Duranta erecta (El-Lakwah et al., 1996); Dysoxylum cauliflorum (Prijono et al., 1997); Erythrophleum guineense (Adedire and Lajide, 1999); Eucalyptus spp. (El-Lakwah, 1996; Gakuru and Foua, 1996); Hyptis suaveolens (Adedire and Lajide, 1999); Ipomoea mauritiana (Dharmasena et al., 1998); Lantana camara (Dharmasena et al., 1998); Lippia multiflora (Koumaglo et al., 1996); Monodora myristica (Okonkwo and Okoye, 1996); Morinda tinctoria (Babu et al., 1999); Myroxlon balsamum (Dharmasena et al., 1998); Ocimum basilicum (Gakuru and Foua, 1996); Piper spp. (Lognay et al., 1996; Gakuru and Foua, 1996; Okonkwo and Okoye, 1996; Rajapakse, 1996); Pothomorphe umbellata (Adedire and Lajide, 1999); Stelechocarpus cauliflorus (Prijono et al., 1997); Syzygium aromaticum (Adedire and Lajide, 1999); Tamarindus indicus (Dharmasena et al., 1998); Tetrapleura tetraptera (Gakuru and Foua, 1996); Vitex spp. (Dharmasena et al., 1998; Raja et al., 2000); Xylopia aethiopica (Okonkwo and Okoye, 1996; Ojimelukwe and Okoronkwo, 1999); Zanthoxylum zanthoxyloides (Ogunwolu et al., 1998).
The most well known of anti-bruchid phytochemicals is azadirachtin which has been used alone, in 'botanical insecticides' or as a component of leaves or extracts (liquid or powder) of the neem tree, Azadirachta indica, particularly in the Indian subcontinent (Ogunwolu and Odunlami, 1996; Javaid and Mpotokwane, 1997; Rajapakse, 1998; Banjo and Mabogunje, 1999; El-Lakwah and El-Kashlan, 1999; El-Lakwah et al., 1999; Lale and Abdulrahman, 1999). Azadirachtin is both an anti-ovipositant and insecticide (larvicide and adulticide). Neem oil and other extracts or neem derivatives may be applied directly to seeds, where volatiles also have a fumigant effect (Reddy and Singh, 1998).
The effects of some phytochemical admixtures on bruchid parasitoid activity have been investigated (Raja et al., 2000).
Cultural Control and Sanitary Methods
Intercropping maize with cowpeas, and not harvesting crops late significantly reduced infestation by C. maculatus, C. rhodesianus, C. chinensis and Acanthoscelides obtectus in Kenya (Olubayo and Port, 1997). Patnaik et al. (1986) also reported that evels of infestation in the field are influenced by the sowing date of the seed.
Good store hygiene plays an important role in limiting infestation by these species. The removal of infested residues from last season's harvest is essential, as is general hygiene.
Solarization (sun drying and heating) can be used to control infestations without affecting seed germination (Mohamed and Ismail, 1996). When small lots are stored, sun-drying the beans periodically in a thin layer for periods of up to 4 hours can give substantial protection. Solar heaters or tranparent bags of seeds left in the sun can provide excellent control of infestations (Ntoukam et al., 1997; Ghaffar and Chauhan, 1999).
Irradiation by ionising gamma radiation has proved effective in controling C. maculatus in stores, although the practice is not widely allowed and may be costly. Hatching of eggs appears to be prevented at 10 Gy; larval development is arrested at 20 Gy; pupal development is arrested at 150 Gy. Up to 1500 Gy may be required to kill adults (Dongre et al., 1997), although sterilization of adult males and females may be achieved at doses of less than 100 Gy (Diop et al., 1997; Pajni et al., 1997a, b)
Cultivars of host seeds vary considerably in their susceptability to insect attack (Ghadiri and Sohrabi, 1999; Padmavathi, 1999), and there has been much interest in screening varieties of seeds for resistance (Kalyan and Dadhich, 1999; Lambrides and Imrie, 2000), including artificially generated mutant lines (Wongpiyasatid et al., 1999) and resistant wild progenitors of commercial varieties (Dongre et al., 1996). The biochemical basis of resistance in seeds has been elucidated in some cases (Miura et al., 1996; Xavier-Filho et al., 1996). The seed chemicals responsible for resistance (mainly in cowpea varieties) include trypsin inhibitors (Shade et al., 1996), tannins (Oigiangbe and Onigbinde, 1996), chitinases and beta-1, 3-glucanases (Gomes et al., 1996), and insecticidal lectins ((Zhu et al., 1996; Omitogun et al., 1999).
Adzuki beans have been genetically modified to express alpha-amylase inhibitors (alphaAI), making them resistant to C. maculatus and C. chinensis (Ishimoto, 1996).
Biological control has not been widely used against Callosobruchus species, although natural populations of C. maculatus are often subject to high levels of parasitism, particularly in West Africa (Ouedraogo et al., 1996). It seems likely that studies conducted on the complex biology of plant-host-parasitoid interactions (for example, Monge and Cortesero, 1996) and the effect of climate (Ouedraogo et al., 1996) and host density (Tuda, 1996, 1998; Sanon and Ouedraogo, 1998) on parasitoid behaviour may be more likely to influence changes in storage practices to encourage parasitoids than encourage the implementation of classical biological control programmes. Nontheless, mass rearing techniques for parasitoids have been developed (Islam, 1998) and proceedures for control by innoculation of parasitoids have been suggested (Sanon et al., 1998). Much research has focussed on the larval and pupal parasitoids Dinarmus acutus (Gupta et al., 1998), Dinarmus basalis (Ohashi, 1996; Ouadraogo et al., 1996; Ahmed, 1997; Gupta et al., 1998; Islam, 1998; Sanon and Ouedraogo, 1998; Sanon et al., 1998; Schoeller, 1998; Rojas-Rousse et al., 1999), Eupelmus orientalis (Schoeller, 1998; Rojas-Rousse et al., 1999), Eupelmus vuilleti (Terrasse, 1996; Sanon and Ouedraogo, 1998; Schoeller, 1998; Rojas-Rousse et al., 1999) and Heterospilus prosopidis (Tuda, 1996, 1998; Tuda and Iwasa, 1998); and the egg parasitoids Uscana lariophaga (Van-Alebeek, 1996; Van-Alebeek et al., 1996; Van-Alebeek and Van Huis, 1997; Van-Huis et al., 1998; Zaghloul and Mourad, 1998) and Uscana mumukerjii (Pajni et al., 1996).
Entomophagus fungi (Beauveria bassiana and Metarhizium anisopliae) and bacteria (Bacillus thuringiensis) exhibit only a limited amount of efficacy against C. maculatus (Lopez-Meza and Ibarra, 1996; Vilas-Boas et al., 1996).
ReferencesTop of page
Adedire CO; Lajide L, 1999. Toxicity and oviposition deterrency of some plant extracts on cowpea storage bruchid, Callosobruchus maculatus Fabricius. Zeitschrift fu^umlaut~r Pflanzenkrankheiten und Pflanzenschutz, 106(6):647-653; 20 ref.
Ahmed KN; Nargis A; Husain MM, 1997. Parasitism of different stages of the host, Callosobruchus maculatus (F.) infesting different pulses by Dinarmus basalis (Rond.) (Hymenoptera: Pteromalidae). Bangladesh Journal of Scientific and Industrial Research, 32(1):35-38; 14 ref.
Aku AA; Ogunwolu EO; Attah JA, 1998. Annona senegalensis L. (Annonaceae): performance as a botanical insecticide for controlling cowpea seed bruchid, Callosobruchus maculatus (F.) (Coleoptera: Bruchidae) in Nigeria. Zeitschrift fu^umlaut~r Pflanzenkrankheiten und Pflanzenschutz, 105(5):513-519; 11 ref.
Alebeek FANvan; Bezemer TM; Huis Avan; Lenteren JCvan, 1996. The functional response of Uscana lariophaga under different egg distributions of its host Callosobruchus maculatus. Entomologia Experimentalis et Applicata, 81(2):227-233; 38 ref.
Alebeek FANvan; Koning CM; Korte EAPde; Huis Avan, 1996. Egg-limited functional response of Uscana lariophaga, egg parasitoid of bruchid beetle pests in stored cowpea. Entomologia Experimentalis et Applicata, 81(2):215-225; 36 ref.
Alebeek Fvan, 1996. Foraging behaviour of the egg parasitoid Uscana lariophaga: towards biological control of bruchid pests in stored cowpea in West Africa. Foraging behaviour of the egg parasitoid ^italic~Uscana lariophaga^roman~: towards biological control of bruchid pests in stored cowpea in West Africa., 176 pp.
Amevoin K; Glitho IA; Monge JP; Huignard J, 2005. Why Callosobruchus rhodesianus causes limited damage during storage of cowpea seeds in a tropical humid zone in Togo. Entomologia Experimentalis et Applicata, 116(3):175-182. http://www.blackwell-synergy.com/servlet/useragent?func=showIssues&code=eea
Appel AG; Moar WJ; Tanley MJ, 1999. Water loss and mortality of adult cowpea weevils (Coleoptera: Bruchidae) exposed to desiccants and desiccating environments. Environmental Entomology, 28(6):979-982; 25 ref.
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Babu A; Raja N; Albert S; Ignacimuthu S; Dorn S, 1999. Comparative efficacy of some indigenous plant extracts against the pulse beetle Callosobruchus maculatus F. (Coleoptera: Bruchidae). Biological Agriculture & Horticulture, 17(2):145-150; 12 ref.
Banjo AD; Mabogunje B, 1999. Relative efficacy of some plant parts and seeds in the control of Callosobruchus maculatus (F.) - a pest of cowpea [Vigna unguiculata (F.) Walps.]. Crop Research (Hisar), 17(3):395-398; 12 ref.
Blanco-Labra A; Sandoval-Cardoso L; Mendiola-Olaya E; ValdTs-Rodrfguez S; L=pez MG, 1996. Purification and characterization of a glycoprotein
Caswell GH, 1970. The Storage of Cowpea in the Northern States of Nigeria. Samaru Research Bulletin No. 120. Zaria, Nigeria: Institute for Agricultural Research Samaru, Ahmadu Bello University.
Chitra Srivastava; Sinha SN, 2008. Susceptibility of Callosobruchus sp. collected from various NSP Centres to insecticides. Annals of Plant Protection Sciences, 16(2):337-340. http://www.indianjournals.com/ijor.aspx?target=ijor:apps&type=home
Desroches P; Mandon N; Baehr JC; Huignard J, 1997. Mediation of host-plant use by a glucoside in Callosobruchus maculatus F. (Coleoptera: Bruchidae). Journal of Insect Physiology, 43(5):439-446; 33 ref.
Dharmasena CMD; Simmonds SMJ; Blaney WM, 1998. Insecticidal activity of eight plant species on egg laying, larval development and adult emergence of Callosobruchus maculatus (F.) in cowpea. Tropical Agricultural Research and Extension, 1(1):67-69; 9 ref.
Dongre TK; Harwalkar MR; Nene SP; Padwal-Desai SR, 1997. Radio-sensitivity of different developmental stages of pulse beetle (Callosobruchus maculatus). Journal of Food Science and Technology (Mysore), 34(5):413-415; 10 ref.
Dongre TK; Pawar SE; Thakare RG; Harwalkar MR, 1996. Identification of resistant sources to cowpea weevil (Callosobruchus maculatus (F.)) in Vigna sp. and inheritance of their resistance in black gram (Vigna mungo var. mungo). Journal of Stored Products Research, 32(3):201-204.
El-Lakwah FA; Abdel-Latif A; El-Sayed FM, 1999. Toxicity and joint action of the botanical insecticide Neemazal-W with malathion to the cowpea weevil, Callosobruchus maculatus (F). Egyptian Journal of Agricultural Research, 77(3):1023-1034; 27 ref.
El-Lakwah FA; Darwish AA; Halawa ZA, 1996. Toxic effect of extracts and powders of some plants against the cowpea beetle (Callosobruchus maculatus, F.). Annals of Agricultural Science, Moshtohor, 34(4):1849-1859; 14 ref.
Fitzner MS; Hagstrum DW; Knauft DA; Buhr KL; McLaughlin JR, 1985. Genotypic diversity in the suitability of cowpea (Rosales: Leguminosp) pods and seeds for cowpea weevil (Coleoptera: Bruchidae) oviposition and development. Journal of Economic Entomology, 78(4):806-810
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