| Titles |
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English :
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Control of bollworms in cotton fields by releasing trichogramma and insecticidal treatments
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Arabic :
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مكافحة ديدان اللوز بطفيل الترايكوجراما والمبيدات فى حقول القطن
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| Abstract |
The present investigation was conducted at Bassuon region, Gharbia Governorate , during 2004 and 2005 cotton seasons to evaluate certain treatments of releasing the egg parasite, Trichogramma evanescens and insecticidal sprays against the pink bollworm, Pectinophora gossypiella and the spiny bollworm, Earias insulana, in cotton fields, as well as the effect on seed cotton yield.
The results showed that 4 insecticidal sprays caused the highest average percentages of reduction during the two seasons of the study in pink bollworm (PBW) population (62.07% reduction), followed by the treatment of 3 releases of the parasite then 2 insecticidal sprays (61.13% reduction). The treatments of 5 or 4 releases of the parasite and 3 sprays of insecticides caused lower effects on PBW larval population (50.85, 45.85 and 48.46% average reduction during the two seasons, respectively).
The effect of the parasite on spiny bollworm (SPW) population was more slight. Five or four releases of Trichogramma caused only 33.56 and 26.86% average reduction in SPW population, respectively. The treatment of 3 releases of the parasite followed by 2 insecticidal sprays induced higher efficiency, causing 51.91% average reduction, but the treatments of 3 or 4 insecticidal sprays caused he highest effect (58.06 and 61.95% average reduction, respectively) .
With respect to the combined effect on the two bollworm species during the two seasons, the lowest effects were recorded when the parasite was treated alone (46.38% average reduction for 5 releases and 40.97% for 4 releases). The highest effects (62.04 and 58.74% average reduction) were achieved for the treatments of 4 insecticidal sprays and 3 releases of the parasite then 2 insecticidal sprays. Three sprays of insecticides caused moderate effect (50.90% average reduction).
All treatments caused satisfactory increases in seed cotton yield as compared to the untreated check. The average percentages of increases in seed cotton yield during the two seasons of 2004 and 2005 could be arranged descendingly as follows: 4 sprays of insecticides (61.42%), 3 releases of the parasitoid followed by 2 insecticidal sprays (60.71%), 5 releases of the parasite (52.53%), 3 insecticidal sprays (51.37%) and 4 releases at Trichogramma (42.58% average increases in seed cotton yield).
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| Publication year |
2008
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| Pages |
36-47
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| Organization Name |
Plant Protection Research Institute (PPRI)
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| City |
السادات
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| serial title |
المؤتمر الدولى الأول للعلوم والبحوث البيئية بجامعة المنوفية ـ فرع السادات
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| Author(s) from ARC |
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| Agris Categories |
Protection of plants - General aspects
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AGROVOC
TERMS |
Earias insulana.
Larvae.
Pectinophora gossypiella.
Trichogramma evanescens.
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| Publication Type |
Conference/Workshop
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