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POPULATION DYNAMICS AND MANAGEMENT OF THRIPS IN BULB ONION USING VEGETABLE INTERCROPS (Pages : 8 - 15)

M.M. HOSSAIN, K.M. KHALEQUZZAMAN, M.A.A. MAMUN, M.J. ALAM AND R.N. AHMED

The field experiment was conducted at Spices Research Centre, Shibganj, Bogra during Rabi season of 2014-15 to study the population dynamics and to evaluate the effectiveness of intercropping Carrot, Tomato and French bean with onion for the management of thrips attacking onion. Variety BARI Piaz-1 was intercropped with each of the vegetables and insecticide Imidacloprid was used as a standard check. The treatments were five including control. Infestation of onion thrips was started from the first week of February and it become gradually increases upto first week of April then it was declined. Thrips populations were positively correlated with temperature and negatively with relative humidity and rainfall. Thrips incidence and damage severity were determined at 7 days interval with damage severity being estimated on a scale of 1-5. Total and marketable bulb yield were determined at physiological maturity. Intercropping onion with carrot, tomato and insecticide Imidacloprid significantly reduced thrips population over control up to 52.42, 48.84 and 58.97%, respectively, but French bean had no significant effect. The three vegetable intercrops significantly reduced damage severity, with insecticide Imidacloprid showed the greatest damage reduction up to 23.81% followed by carrot (21.04%) and tomato (11.90%). Intercropping onion with tomato and carrot showed significantly lower onion bulb yield (6.6 t/ha and 7.54 t/ha, respectively) but statistically comparable to that of French bean (8.62 t/ha). The effect of Imidacloprid on yield (11.24 t/ha) was statistically higher. The reduction in bulb yield was compensated by the yield from the vegetable intercrops and, therefore, no loss was incurred in carrot and tomato showing higher MBCR (12.55 and 17.90, respectively) compared to Imidacloprid (5.52). This study showed that Carrot or Tomato intercrop may be utilized as intercrop for the management of onion thrips. Download


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