Invasive Species Compendium

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Abstract Full Text

Evaluating the biocontrol potential of insects auxiliary and bio- insecticide extracted from Citrullus colocynthis against Parlatoria blanchardi in date palm in Saoura Oases, Algeria.


Saoura, is an Algerian desert region, characterized by a height density of date palm trees (more than 300000). Despite this high density, the production of dates has seen a continuous decrease due to multiple reasons including increasing water salinity, the spread of many fungal diseases and insect pests where the most serious is Parlatoria blanchardi. The random use of Malathion during the invasions of desert locusts caused an ecological imbalance, where the majority of the natural enemies of date palm scale (DPS) disappeared, as consequence the population of DPS expanded increasingly. This study aims to find alternative methods to control pests taking into consideration the ecological balance. For this purpose, three entomofauna inventories were carried out to study the dynamics of insect populations and for introduction and acclimatization of new auxiliary insects to biocontrol the large infestation of DPS. we also looked to find a biodegradable insecticide extracted from Citrullus colocynthis (desert plant pariah by insects due to its toxicity). By comparing the results we noticed that effectiveness of the colocynth aquatic extracts on the target insect was as high as 65.99% however it's side effects on ecosystem were negligible unlike Malathion which exterminated over than 301 non-target insects where 68% are useful such as bees, butterflies, some entomophagous insects and even some vertebrate such as Oenanthe leucopyga. Finally, a phytochemical screening and toxicological studies are recommended to determine exactly which component in colocynth is more effective on DPS and its undesirable effect on human health.