EFFECT OF SOME FORMULATED PESTICIDES ON TETRANYCHUS URTICAE AND ITS PREDATORAMPLYSEIUS GOSSIPI
Refaat Ibrahim EI-Sayed Magouz;
Abstract
Phytophagous mites arc potentially a major pest or the main food, fibre and ornamental crops. This potential for damage has become
increasingly evident during the last few decades. Sp1der mites may cause severe damage which results in very heavy losses in such crops as citrus, beans, cl)tloll. apples amlmany other horticultural allll ornamental crops. It is known that spider mites do not commonly cause widespread damage in agroecosystems where productivity is for below its potential, regulatory factors such as diseases and predators control the spider mite population, while in agroecosystems where production levels are high broad-spectrum pesticides arc usually used. The pesticides have a more adverse ci'J'cct on the pred:1tnrs rather than on the spider mites themselves thus enabling an outbreak of the later.
Low levels of pesticides which do not cause mortality can influence the success of a predator as a result of behavioural modification.
The present. study was directed to investigate the toxic etfect of some insecticide against the adult females of the two-spotted spider mite Tctranychus urticae and to examine the sublethal etTects of these insecticides on fecundity of this mites and its predator Amp vseius gossipi and on hatchability of spider mite eggs. The feeding behavior of the predator under sublethal insectecidal effect was also studied.
The results• achieved in this study can be summarized m the following findings.
increasingly evident during the last few decades. Sp1der mites may cause severe damage which results in very heavy losses in such crops as citrus, beans, cl)tloll. apples amlmany other horticultural allll ornamental crops. It is known that spider mites do not commonly cause widespread damage in agroecosystems where productivity is for below its potential, regulatory factors such as diseases and predators control the spider mite population, while in agroecosystems where production levels are high broad-spectrum pesticides arc usually used. The pesticides have a more adverse ci'J'cct on the pred:1tnrs rather than on the spider mites themselves thus enabling an outbreak of the later.
Low levels of pesticides which do not cause mortality can influence the success of a predator as a result of behavioural modification.
The present. study was directed to investigate the toxic etfect of some insecticide against the adult females of the two-spotted spider mite Tctranychus urticae and to examine the sublethal etTects of these insecticides on fecundity of this mites and its predator Amp vseius gossipi and on hatchability of spider mite eggs. The feeding behavior of the predator under sublethal insectecidal effect was also studied.
The results• achieved in this study can be summarized m the following findings.
Other data
| Title | EFFECT OF SOME FORMULATED PESTICIDES ON TETRANYCHUS URTICAE AND ITS PREDATORAMPLYSEIUS GOSSIPI | Other Titles | تأثير بعض تجهيزات المبيدات على الأسكاروس تترانيكس أورتيكا وعلاقته بالمفترس أمبليسيس جوسيباى | Authors | Refaat Ibrahim EI-Sayed Magouz | Issue Date | 1997 |
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