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Abstract
monitor vegetable growth: nematicide-resistant bacteria: nematicide interaction, is in an attempt to improve plant establishment and growth in agrochemical-stressed environments. Apart from chemical compound, culture medium accommodated 104 – 105 cfu ml-1 total bacteria when supplied with one third the recommended dose of either basamid, caratan, hayli, mocap, nemacur, rugby, temik, or vydate. Raising the agrochemical quantity to two thirds markedly decreased bacterial counts. Decrease percentages were the highest (59.2) with nemacur and the lowest (13.4) in nutrient agar received vydate. Significant negative correlations were recorded between nematicide concentration and bacterial population, the coefficients of determination (R2) varied from 0.7951 to 0.9846. In general, the organophosphate agrochemicals did support bacterial propagation much better those of carbamate nature. Based on cultural features of colonies developed on nutrient agar medium containing the double recommended levels of tested nematicides, 65 diverse colonies were picked up and purified. Among those, five isolates were identified and were found belonging to the genera Aerococcus spp., Aminobacter spp., Bacillus spp., Ensifer spp. and Pseudomonas spp. Response of cabbage and eggplants to inoculation with a composite inoculum of the five nematicide-tolerant bacterial candidates was evaluated in soil treated with three nematicides. All the applied agrochemicals severely injured vegetable growth, but inoculation did partially overcome such effect. Tomato plants positively responded to diazotroph inoculation particulary in presence of rational N fertilizer level and a microbial preparation of nematicide-tolerant bacterial isolates. Collectively, this study conveys information to decision-makers for better hygienic vegetable production, an indispensable necessity for exportation.