Grain sorghum in the Northern Territory.
This manual, which has been prepared to assist farmers growing grain sorghum under rain-fed conditions in the Top End of the Northern Territory of Australia, contains a section (pp. 52-69) on the bionomics and control of arthropods (mainly insects) that attack the crop there. The principal species dealt with include Contarinia sorghicola (Coq.), which was first recorded from the Northern Territory in March 1970 and at present causes damage of economic importance in only a few areas; the armyworms Mythimna (Pseudaletia) separata (Wlk.), which occurs on sorghum each year, and Spodoptera exempta (Wlk.), outbreaks of which occur sporadically; the locusts Austracris guttulosa (Wlk.), Gastrimargus musicus (F.) and Locusta migratoria (L.), which are present throughout the year but cause most damage in the late dry season (August-October) and the late wet season (March-April); Heliothis armigera (Hb.), the larvae of which feed on the developing grains; Cryptoblabes adoceta Turner and Sathrobrota rileyi (Wlsm.), the larvae of which feed on the ripening grains and attack both dry season and wet season crops; and aphids (Rhopalosiphum sp.) and Delphacids.The manual also contains a section (pp. 98-102) in which notes are given on the principal insect pests associated with the stored grain and on measures that should be taken to prevent or control infestation during storage. The species concerned are Sitophilus oryzae (L.), Rhyzopertha dominica (F.), Oryzaephilus surinamensis (L.), Tribolium castaneum (Hbst.), Cryptolestes pusillus (Schonh.) and Ephestia cautella (Wlk.).