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[9000699.] رقم البحث : 9000699 - |
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Field Evaluation Of Some Insecticides Against Pink And Spiny Bollworms On / |
| تخصص البحث : General |
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Agricultural Research Journal Suez Canal University / |
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Raslan¹, S. A. A |
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A. A. A. Aioub |
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M. E. A. Hegab |
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S. S. M. Hassanein |
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Bollworms, Control programs, Insecticides, Cotton plants, Natural enemies, Yield. |
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Three conventional insecticides i.e., S-fenvalerate (F), profenofos (P) and thiodicarb (T) were
evaluated against both pink and spiny bollowroms on cotton plants using six different spray programmes,
i.e, spraying each of the tested insecticides individually in one spray (F, P, T), spraying S-fenvalerate in
the first spray followed by profenofos in the second (F+P), spraying profenofos in the first spray followed
by thiodicarb in the second (P+T), and spraying S-fenvalerate in the first spray followed by profenofos in
the second spray and then thiodicarb in the third (F+P+T). These programmes were started when
percent of boll infestation reached 1,3,5,7 and 9% through two consecutive cotton growing seasons of
1998 and 1999. Morever the effect of the three spraying programmes (F, F+P and F+P+T) on the
population reduction of some predaceous arthropod species were also investigated. The obtained results
showed that F+P and F+P+T spray programmes seemed to be the most efficient against pink and spiny
bollworms as cotton plants treated with them showed low percents of boll infestation with each and
yielded high amounts of seed cotton. Cotton plants treated by different spray programmes at 5% boll
infestation were less infested by both bollworms and gave the highest yield compared either with other
tested levels or with check experiment. Consequently, F+P programm can be recommended to control
pink and spiny bollworms in cotton fields and the third spray of the other program (F+P+T) can be
excluded and this is very usefull for reducing control costs as well for increasing activity of parasitic and
predaceous natural enemies of insects and true spiders. F, F+P and F+P+T programs had an adverse
effect on the population of predaceous arthropods prevailing in cotton fields. |
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