29. To study the effect of natural enemy Trichogramma chilonis (Ishii) against spotted bollworm (Earias Vittella F.) on okra

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Sher Ahmed Sarfraz Ahmed Munir Ahmad Khetran Safeer Ahmed, Shahzad Ahmed Shahwani Mohammad Amin Muhammad Iqbal Jakhro

Abstract

The present study was conducted at the Pussia Goth near Tandojam during the year 2016, to study the effect of natural enemy Trichogramma chilonis (Ishii.) against spotted bollworm (Earias Vittella Fabricius) on okra. Observations on spotted bollworm population were recorded at once per week. Pre-treatment observation was recorded one day before release and post-treatment observation was recorded three and five days after release. The reduction percentage was also calculated. The maximum population of spotted bollworm recorded in 6th week was (17.66±1.72) and minimum population in 10th week was (14.33±0.29) in control plot during 1st to 10th weeks duration, respectively. The natural enemies were released at the interval of 10 days. However, the population in treated plot after 3 days of (T. chilonis) releases the maximum population of spotted bollworm was recorded in 2nd week (8.89±1.24) and minimum population in 10th week (6.19±0.29) during 1st to 10thweek duration, respectively. Peak level of spotted bollworm was observed during 1st and 2nd weeks afterward the spotted bollworm population was declined in a linear sequence from 3rd to 10th weeks. Similarly, after 5 days (T. chilonis) releases, the maximum population of spotted bollworm was recorded in 1st week (10.16±1.33) and minimum population in 10th week (8.00±0.41) during 1st to 10th week duration, respectively. Peak level of spotted bollworm was observed during 1st and 2nd weeks afterward the spotted bollworm population was declined in a linear sequence from 3rd to 10th weeks. Moreover, the results showed that spotted bollworm populations were considerably declined in treated plots due to the presence of T. chilonis as compare to control plot.


Keywords: Biological agent; Okra; Population; Spotted bollworm


http://dx.doi.org/10.19045/bspab.2018.70081

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