INTEGRATION BETWEEN TRANSPLANTING DATE AND CULTIVAR TYPE IN MANAGEMENT POPULATION OF ONION THRIPS (THYSANOPTERA: THRIPIDAE) ATTACKING ONION PLANTS IN THE FIELD CONDITIONS

Abstract

Onion thripsThripstabaci (lind.) is one of the most economically important pests of onion for its high reproductivity rate, short generation time and ability on damage onion plants during season growth. The main goal of this study is to evaluate the response of thrips population towards transplanting dates (early, middle and late transplanting date) and towards onion cultivars: Giza 20 (yellow onion) and Ahmartantawi (red onion) during winter seasons of 2013/ 2014, 2014/ 2015 and 2015/ 2016, as well as evaluate insect development and onion productivity. Results showed that T.tabaci passed by 1- 3 periods of activity on plants of both cultivars that transplanted on three dates during different seasons. Thrips population reached its maximum count in March, April and May, indicating to favorability of these periods for insect activity and reproduction. Seasonal average of thripspopulation  on Giza 20 plants were ranged between 19.97 and 52.51 individual/ plant, whilst on Ahmartantawi plants, ranged between 16.77 and 44.17 individuals/ plant. It is argued that onion plants cultivar "Ahmartantawi" had attacked and harboured the lower population of thrips than Giza 20 plants, it was higher by 24.8% in Giza 20 comparing with another one. As well as plants transplanted in early date had attacked and harboured  the lowest population of thrips among the transplanting dates, it was higher by 51.25 and 121.04% in plants of middle and late transplanting comparing with the early one. 

Keywords

• Thrips tabaci,Giza 20 cultivar,Ahmar tantwi cultivar,population.

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