النظام الحراري المرتفع و تأثيره في السمات الحيوية لنمو و تكاثر حشرة خنفساء اللوبياء (Collosobruchus maculatus (F.)‎ (Coleoptera : Bruchidae و كعامل بيئي يحد من أضرارها على الحبوب المخزونة

Abstract EN

Under laboratory conditions, the biology of cowpea weevil Collosobruchus maculatus F.

in cowpea seeds was evaluated at temperature regimes of 25, 30 and 35 °C and relative humidity of 65±5%.

The main purpose of the study was to identify the best temperature that could reduce the insect activity.

Results obtained showed that increasing the temperature from125 to 35°C lead to significant reduction in number of eggs produced/female, % egg hatching, larval seed penetration and the number of adult insects emerging from the seeds/female.

In addition, the larval stage, which is the most damaging stage, was shortened and consequently reduced the amount of food consumed.

The high temperature (35°C) also prolonged the period from adult emergence from the seed until egg-laying and reduced the number of eggs laid per day and consequently the total number of eggs produced/ female.