Effect of insect growth regulators on Pectinoghora gossypiella, Spodoptera littoralis (Lepidoptera : Gelechidae : Noctuidae)‎ eggs and a predator spider Thanatus albini (Arachnida : Philodromidae)‎ egg-sacs with some biological aspects of predator

الملخص EN

Under the laboratory condition of 27±1°C and 70- 75% RH.

two experiments were conducted under the laboratory conditions of 26±1°C and 65-70% RH.

to study the effect of the insect growth regulator, diflurobenzeron ( Dimilin ) ; 48% on toxicity, of Pectinophora gossypiella (Saundars) , Spodoptera littoralis (Boisduval) (Lepidoptera: Gelechidae: Noctuidae) eggs and spider predator Thanatus albini (Audouin) (Arachnida: Philodromidae) egg-sacs as well as on some biological aspects of predator.

Results were concluded that the egg incubation period averaged 6.3 days/eggs of S.

littoralis treated, while it decreased to 4.4 days/ eggs in untreated, P.

gossypiella was (6.5 days) in treated than (3.6 days) in untreated and T.

albini predator egg-sacs was 18.3 days in treated compared with 13.3 days in untreated also, predatory spiderling was able to develop and reproduce better on P.

gossypiella and S.

littoralis untreated than treated.

The spider passes through seven spiderlings during its life.

The total period of the first and second instar spiderlings lasted 24.0 and 17.9 days when spiderlings resulted from eggs treated and untreated, respectively, and fed on moving stages of the Tetranychus urticae Koch (Acari: Tetranychidae) .

While, the total period from 3rd to 7th spiderlings longer to 119.0 and 133.0 days when resulted from eggs treated and shorted to 79.76 and 81.4 days when the spider resulted from eggs untreated (control) and fed on P.

gossypiella and S.

littoralis, respectively.

The total food consumption of the predator was 348.0 and 378.7 preys/PBW treated and untreated respectively, while it was 248.6 and 279.7preys S.

littoralis /predator, treated and untreated, respectively.