الخصائص الحيوية للخنفساء الجعالية Maladera insanabilis (Brenske)‎ و كثافتها العددية

Abstract EN

Investigation of biological characteristics of the scarabid beetle maladera insanabilis (brenske) (coleoptera: scarabaeidae) showed that the females laid eggs in groups of 16.5 egg/female/day.

the eggs hatched after 5.5 days with hatching rate of 95%.

the larvae developed through three instars, lasted 13.5, 14.5 and 28 days, respectively.

the average period of total larval stage was 56 days, 11 days for the pre-pupa and 14 days for the pupa.

the pre-mating and mating periods were 6 days and 18.5 minutes, respectively.

the average female and male longevity was 38.5 and 20 days, respectively.

in addition, the total duration of the life cycle was 114 days for the female and 96 days for the male.

the study showed also that the light traps were highly efficient to attract and catch the insect adults.

first appearance of the pest was on 10th april 2016, when the pest appeared in few numbers, then started to increase until they peaked in may and june.

this was the insect's first generation following hibernation in the soil.

the results revealed that the number of trapped adults during may and june reached 935 and 1049 individuals/month, respectively.

the number decreased gradually during july.

the second peak of the pest was observed during august and september, and reached 4422 and 4844 insects, respectively.

the insect disappeared starting december, and started to hibernate as mature larvae in the soil.