SOME BIOTIC AND ABIOTIC FACTORS AFFECTING THE BIOLOGY OF PHYTOSEIUS PLUMIFER (CANESTRINI AND FANZAGO) (ACARI: PHYTOSEIIDAE)

Document Type : Original Article

Authors

1 Plant Protection Research Institute, Agricultural Research Centre, Dokki, Giza, Egypt

2 Faculty of Agriculture, Cairo University, Giza, Egypt

Abstract

Some biotic and abiotic factors affecting the biology of the pred­atory mite Phytoseius plumifer(Canestrini & Fanzago) were studied using the two-spotted spider mite Tetranychus urticae Koch immatures as a food source. The fermal comanionship with male allover her longevity (multiple mating) gave female shortest longevity (45.2 days), and greatest fecundity (390 eggs / female) ; while single mating gave the longest longevity (52.3 days) and the smallest fecundity (82 eggs / fe­male). T.uricae (adults, 20% ; immatures, 10 % ; eggs 10%)gave the greatest attraction percentage (10%) in the shortest time (5.6, 6.7 and 8.5 minutes, respectively) for fed predator female, while the the scale insect Pariatoria zizyphus (Lucas) eggs gave the smallest (5%) and the longest time (91.0 minutes). Also, fed females were better attract­ed to food than 24 and 48 hours starved females. Low temperatures 10°C and 5°C decreased total egg hatchabili­ty. It decreased from 98% to 72 & from 90% to 40% after one to four weeks at the two degrees, respectively. At 10°C and 5°C female surviv­ability and fecundity ranged from 82 & 54% and 29 & 19 eggs / female to 10 & 0% and 5&0 eggs /female after one to four weeks.

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