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Articles by Hany K. Abd-Elhady
Total Records ( 3 ) for Hany K. Abd-Elhady
  Hany K. Abd-Elhady and Ahmed A. Abd El-Aal
  In Egypt pink bollworm Pectinophora gossypiella (Lepidoptera: Gelechiidae) has recently developed resistance to various kinds of insecticide in the field. The resistance status of pink bollworm to several classes of insecticides currently used in cotton fields was evaluated in the Nile Delta (Kafr-Elsheikh and Menoufia) Egypt. Two field-collected P. gossypiella populations have developed resistance to several classes of insecticides. Toxicological bioassays were conducted in the laboratory, LC50’s estimated by probit analysis and Resistance Ratio (RR) were calculated at the LC50 level. Of the seven insecticides tested four insecticides (chlorpyrifos, profenofos, thiodicarb and carbaryl) showed the Resistance Ratio (RR) values above 20 folds, against two field-collected populations whereas the other three insecticides (fenpropathrin, spinosad and abamectin) had RR values less than 10 folds. Also, the patterns of selection pressure by abamectin at the LC30 level to Kafr-Elsheikh (KFR)-and Menoufia (MNF)-field strains were determined by continuous insecticide application under laboratory conditions for eight successive generations. On the other hand, biochemical assays indicated that both KFR-and MNF-field strains expressed higher levels of Acetylcholinesterase (AChE) activity by 4.1 and 2.8-times, respectively, compared to that of susceptible strain. There were significant differences in esterase activities among the field-collected populations and susceptible strain. Analysis of protein patterns by (SDS-PAGE) showed some differences between resistant strains to abamectin, MNF-and KFR-field strains and the bands differed in intensity and molecular weights between all strains. These findings indicate that rapid biochemical assays coupled with biological assays are potential tools for estimating both the intensity of resistance in the field.
  Hany K. Abd-Elhady and Hany M.M. Heikal
  In Egypt, phytophagous mites are serious pests on crops, vegetables and fruits and frequently cause considerable losses in plant yields. Some commercial acaricides with a degree of selective toxicity towards two-spotted spider mite are Tetranychus urticae Koch (Acari: Tetranychidae), but its selective toxicity towards Phytoseiulus persimilis Athias-Henriot (Acari: Phytoseiidae) is under debate. In this study, the field experiments were conducted to evaluate the selectivity of three acaricides on motiles of both two-spotted spider mite and its predator P. persimilis after 3, 7, 14, 21 and 30 days of treatment. Acaricides were sprayed at 1 and 1/2 field recommended rate on apple orchards; flufenoxuron (60.00 and 30.00 mg a.i., L-1), fenpyroximate (25.00 and 12.50 mg a.i. L-1) and abamectin (7.50 and 3.75 mg a.i., L-1). All tested acaricides affected the two mite’s survival; the T. urticae was more susceptible to flufenoxuron application than the P. persimilis. Results showed that half of the recommended rate of flufenoxuron showed slightly toxic effect on P. persimilis after 30 d. Flufenoxuron exhibited moderate toxic to the predatory mite at the two field rates after 14 days and was favorably selective (more toxic to T. urticae than to P. persimilis) at all tested periods. In contrast, fenpyroximate and abamectin were found to be very toxic to the predatory mite at recommended field rate after 30 days and unfavorably selective (more toxic to P. persimilis). In conclusion, fenpyroximate and abamectin should be used carefully in Integrated Pest Management programs.
  El-Zahi S. El-Zahi and Hany K. Abd-Elhady
  Numerous beneficial arthropods prey on aphid populations in cotton fields. Field experiments were conducted at Kafr El-Sheikh Governorate, Egypt in seasons of 2010 and 2011 to examine the impact of naturally occurring insect predators on cotton aphid, Aphis gossypii Glover (Homoptera: Aphididae) comparing to the impact of three insecticides; i.e., diafenthiuron, imidacloprid and thiamethoxam at their recommended rates using caged-plants technique. The toxicity of these insecticides to insect predators was determined likewise. Cotton aphid population on uncaged plants, where insect predators and aphids were allowed to develop undisturbed, declined gradually and consequently showed the lowest population density of aphids per cotton leaf at the last inspection. On the contrary, severe decrease in cotton aphid numbers occurred on caged plants that treated with insecticides and this decrease continued up to 15 days after spray, then increases in aphid numbers happened and significantly indicated the highest aphid population density at the last inspection. Density of aphid populations increased rapidly on caged-untreated plants, where insect predators were excluded and no insecticides were applied and declined only after exceeding the carrying capacity of cotton plants. Diafenthiuron was the most toxic to the insect predators. Imidacloprid and thiamethoxam significantly proved to be the least toxic to insect predators. Further studies are needed to establish the integration effect between selective insecticides and beneficial arthropods to control cotton aphids and other pests.
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