تأثير موعد الزراعة و التسميد البوتاسي و بعض المعاملات الكيميائية و الإحيائية في Thripidae : Karny Thrips palmi الكثافة العددية لحشرة ثربس البطيخ Cucumus sativus L. على نباتات الخيار Thysanoptera

Abstract EN

This study was conducted in a field belongs to the faculty of agriculture / Baghdad University during autumn season 2012 to evaluate the complimentary effects of some agricultural, chemical and biological methods in reducing the population of Thrips (Thrips palmi Karny) on cucumber plants Cucumis sativus L.

in middle of Iraq (Baghdad-Abugraib).

Results showed that all chemical and biological treatments had similar negative effects on population of larval and adult stages ofthrips.

Means were 0.840, 0.470, 0.602 and 0.545 insect / leaf where plants were treated with fungus Beauevria bassiana, fungus Trichoderma harzianum, insecticide Talstar, Talstar + B.

bassiana or Talstar + T.

harzianum, respectively, compared to significant high population, 2.487 insect / leaf resulted from the control treatment.

Fertilization levels interacted differently with different treatments and significantly reduced insects population especially when level ofpotassium (P) was increased, a 50 kg of P / donum suppressed insects population to 0.664 insect / leaf compared to recommended P level, 25 kg / donum that resulted in 1.203 insect / leaf.

Thrips population was also affected by the two P levels where interacted with two planting dates.

A combination of 50 kg / donum, doubled P rate applied at 1st sep.

2012 was more effective in reducing insects population than 25 kg / donum applied at 1st Aug.

2012, means were 0.544 and 1.437 insect / leaf, respectively.