| Titles |
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English :
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Preliminary study on the relationship between percentage of young larvae to the total number of pink and spiny bollworms in cotton bolls before spraying and the efficacy of insecticides against bollworms
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Arabic :
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دراسات مبدئية على العلاقة بين نسبة اليرقات الصغيرة إلى التعداد الكلى لدودتي اللوز القرنفلية والشوكية في لوز القطن قبل الرش وفعالية المبيدات المستخدمة ضد ديدان اللوز
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| Abstract |
Field experiments were conducted during 1999 and 2000 cotton seasons, at Kalubia governorate to study the relation between the percentage of small bollworm larvae on the efficacy of insecticidal treatment against cotton bollworms. Two bio-insecticides, MVPII and Xentari at three rates (rec., double rec. & %z rec.), Dursban (rec. rate) alone and in combination with Xentari or MVPII ('/z rec. rate) were tested. Four applications were started on July 24th to 14th August. Results indicated that the efficacy of tested insecticides against PBW and/or SBW infestation increased as the percentage of small larvae decreased before starting of spraying. Also, results revealed that, MVPII ('/z rec. rate) was effective against SBW and not effective against PBW in the field. On the other hand, Xentari at rec. rate was effective against PBW in occurrence of high population density of young PBW larvae, while the double rate of Xentari was effective against SBW when the percent of young SBW larvae was 7.6 % of the total number of SBW larvae. In addition, results proved that the combination of Dursban with either Xentari or MVPII was more potent against PBW or SBW than each alone.
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| Publication year |
2001
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| Pages |
1307-1315
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| Availability location |
معهد بحوث وقايه النباتات
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| Availability number |
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| Organization Name |
Plant Protection Research Institute (PPRI)
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| City |
مشتهر
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| serial title |
حوليات العلوم الزراعية بمشتهر
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| ISSN |
1110-0419
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| Author(s) from ARC |
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| External authors (outside ARC) |
عادل عبد الحميد حافظ
كلية زراعه مشتهر - جامعه الزقازبق
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| Agris Categories |
Protection of plants - General aspects
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AGROVOC
TERMS |
Cotton.
Field experimentation.
Insecticides.
Larvae.
Pectinophora.
Pectinophora gossypiella.
Spraying.
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| Publication Type |
Journal
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