دراسة حياتية للمتطفل Diadegma semiclausum (Hellen)‎ على العثة ذات الظهر الماسي Plutella xylostella (L.)‎ تحت الظروف المخبرية

الملخص EN

Experiments were conducted at the biological control studies and research center (bcsrc), faculty of agriculture, damascus university, during the 2017-2018 season.

laboratory studies were carried out in the mass rearing unit for the parasitoid diadegma semiclausum (hellen) (hymenoptera: ichneumonidae) on the larvae of the diamondback moth (dbm) plutella xylostella (lepidoptera: plutellidae) which was reared on cabbage as a host under laboratory conditions (temperature 25±2°c, relative humidity 60±5%, light period (day: night) 16:8 h).

the biological parameters of the parasitoid d.

semiclausum were studied for three subsequent generations.

results showed that there was an increase in the rate of males and reduction in the rate of females through successive generations, and the sex ratio of the generation reached 1:0.325 (male: female).

a reduction in the longevity of both male and female, was also observed with subsequent generations, reaching 19.8±1.19 days in the third generation.

no differences in parasitism rate was observed during the first and second generations, whereas there was a reduction in the third generation that reached 60.81±1.26%.

results of the present laboratory rearing studies showed increase in males, decrease in parasitoid longevity (female and male), increase in the duration of one generation of the parasitoid, and morphological and behavioral changes on dbm larva caused by parasitism of d.

semiclausum.