Control of flea beetle Podagrica spp. (Coleoptera: Chrysomelidae) with entomopathogenic fungus Beauveria bassiana (Balsamo) Vuillemin in Okra (Abelmoschus esculentus) (L.) Moench

Abstract :

The effectiveness of entomopathogenic fungus, Beauveria bassiana atcontrolling infestation of Podagrica spp. in okra field was evaluated at a low-land farm (FADAMA) and University Farms site of Federal University of Agriculture, Abeokuta, Ogun State in 2014 late and 2015 early planting seasons respectively. The experiment was laid out in a split plot arrangement fitted into Randomized Complete Block Design. The main plot consisted of two flea beetle susceptible okra varieties (NH99/DA and LD88/1-8-5-2) and sub-treatment was the spray regime (B. bassiana and Lambda-cyhalothrin). The control was the unsprayed okra plots. The isolate of Botanigard 22WP- Beauveria bassiana strain GHA was mixed with water in a knapsack sprayer and applied to the leaves of okra plants from 2 WAP at 3.57g/1.5L of water and repeated at weekly interval for 6 weeks. Lambda-cyhalothrin, a synthetic insecticide which served as a check was mixed with water in a knapsack sprayer at 0.5ml/0.96L of water and repeated at weekly interval. The Na, Cu, Ca, Mg, P, Fe, K and proximate composition of B. bassiana-treated and untreated okra fruits were determined.Irrespective of season, number of flea beetles per plant, percentage of damaged leaves and pods in B. bassiana-treated okra plots were comparable to the ones from okra plants treated with lambda-cyhalothrin. They were however, significantly (P<0.05) lower to the ones from untreated okra plots. The fruit yield from plots treated with B. bassiana and lambda-cyhalothrin were comparable (P>0.05) and significantly (P<0.05) higher than the yield from the untreated plots. The proximate composition and minerals evaluated in B. bassiana-treated okra fruit were not significantly different (P>0.05) from the composition of untreated okra fruits The study concluded that entomopathogenic fungus, B. bassiana reduced the number of Podagrica spp. in treated okra plants and enhanced yield. The use of the treatment is therefore recommended for the control of Podagrica spp. in okra field

Keyword :

Entomopathogenic fungus, Beauveria bassiana, Podagrica spp., lambda-cyhalothrin, proximate composition

Author(s) : Kudemepo, C. T., Osipitan, A. A., Popoola, R. A., Ademolu, K. O.
Downloads : 664
Published Issue : 2018 Vol. 13 Number 1

2018 Vol. 13 Number 1