FIELD EVALUATION OF CERTAIN INSECTICIDES ON PEGOMYA MIXTA VILL. AND RELATED PREDATORS INHABITING SUGAR BEET FIELDS

Document Type : Original Article

Authors

1 Central Agricultural Pesticides Laboratory, Agricultural Research Centre, Dokki, Giza, Egypt

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

Abstract

The role of insecticides, profenofos, diazinon and thiamethoxam, was evaluated against Pegomya mixta infesting sugar beet plants at Kafr El-Sheikh Governorate during two successive seasons 1999/2000 and 2000/2001. The undesirable effect of these insecticides was estimated on certain associated predators, Coccinella undecimpunctata, Chrysoper‌la camas and Paedetus allierii. Diazinon demonstrates the highest toxic effect expressed as mor-tality percentage averages for the immature stages of P. mixta, after 15 days from treatment. The average of reduction percent was 80.9 % for the 1st and 81.3 % for the 2nd season, followed by profenofos (80.4 and 78 5 %). Thiamethoxam, however demonstrates the least averages (69.2 and 70.5 %). On the other hand, diazinon and profenofos demonstrate the highest toxic figures to the related predators, where the reduction aver-ages were 56.9 & 62.5 %, 64.9 & 63.9 % and 35.0 & 59.5 % for C. un-decimpunctata, Ch. camea and P. allied! for the 1st and 2nd seasons, re-spectively. Thiamethoxam ranks next in this respect. The average reduction percentages were 27.7, 31.0 and 25.6 % for C. undecimpunc‌tate, Ch. camea and P. allied!, respectively. 

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