EFFECT OF A SEED TREATING CHEMICAL AND THREE PLANT EXTRACTS ON THE MANAGEMENT OF APHID AND SAWFLY INFESTING MUSTARD IN RELATION TO SOWIMG TIME

Abstract

The experiment was conducted to study the effect of a seed treating chemical and three plant extracts on management of Aphid and Sawfly infesting mustard in relation to sowing time in the field of Sher-e-Bangla Agricultural University farm, Sher-e-Bangla Nagar, Dhaka, Bangladesh during the period from November 2008 to March 2009. In these study the environmental factors were evaluated at three time e.g.23 November, 30 November and 06 December, 2008. The experiment comprised of the following treatments; T1: Confider 70WG @ 3 g/kg seeds; T2: Zinger extract @ 20 ml/L water at 7 days interval; T3: Turmeric extract @ 20 ml/L water at 7 days interval; T4: Neem leaf extract 20 ml/L water at 7 days interval and T5: Control. Three experiments were laid out in three sowing times. Each experiment was set in a Randomized Complete Block Design (RCBD) with three replications. For sowing on 23 November 2008, the lowest number of aphid and sawfly was recorded from T4, while the highest number obtain from T5 treated plots at early, mid and late flowering and fruiting stages. The seed yield per hectare was recorded highest from T4 (2.34 t/ha), while the lowest from T5 (2.01 t/ha) treated plots. Sowing on 30 November, 2008 showed the lowest number of aphid and sawfly in T4, while the highest number from T5 treated plots at early, mid and late flowering and fruiting stages. The highest yield was obtained from T4 (2.64 t/ha), while the lowest yield was recorded from T5 (2.02 t/ha) applied plots. Mustard sown on 06 December, 2008 the lowest number of aphid and sawfly in T4, while the highest number in T5 treated plots at early, mid and late flowering and fruiting stages. The highest yield was recorded from T4 (2.21 t/ha) and the lowest yield from T5 (1.95 t/ha) applied plots.