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Damage of flower chafer beetle Oxycetonia versicolor Fabricius ((Scarabaeidae: Coleoptera) on brinjal in Dharmapuri district, Tamil Nadu

Shanmugam Ps, Ayyadurai P, Sangeetha M, Balamurali R
Journal of Entomology and Zoology Studies , Volume 8, pp 32-35; doi:10.22271/j.ento.2020.v8.i5a.7505

Abstract: The occurrence of flower chafer beetle Oxycetonia versicolor Fabricius in brinjal has been studied in Dharmapuri district during 2018 - 19 and 2019 - 20. The survey was under taken in the major brinjal growing regions of Dharmapuri district during 2018-19 and 2019-20. In Dharmapuri district brinjal has been cultivated in precision farming and conventional method. The flower chafer beetle incidence was noticed in all the surveyed fields and the incidence was more during 45 days after transplanting and decreased after 75 days after planting. The number of beetles per ten plants was ranged between 0.3 – 1.3, 1.5 – 4.6, 2.1 – 5.1, 0.8 – 2.4 and 0.4 – 1.3 during 2018-19, 0.6 – 1.6, 1.4 – 5.5, 1.8 – 6.6, 0.6 – 2.3, 0.5 – 1.3 during 2019 – 20 at 30, 45, 60, 75 and 90 days after planting respectively. The study on the incidence flower chafer beetle in the treated and untreated fields conducted at Krishi Vigyan Kendra farm revealed that lower incidence in the treated fields. The number of chafer beetles per ten plants in the treated fields were 4.0, 3.4, 2.8, 2.0 and 2.0 at 30, 45, 60, 75 and 90 days after transplanting. The beetles initiate their feeding on holes made by the brinjal shoot and fruit borer. They also found feeding on the tender shoots, buds and flowers of the brinjal plants. In some plant’s congregation of 4-6 adults and frothy secretion were noticed. The periodical application of insecticides for the management of shoot and fruit borer L. orbonalis keeps the beetle population under check. The beetle population was more during August to October months and thereafter the population declines. The occurrence of flower chafer beetle during the reproductive stage of the brinjal will lead to huge economic loss to the farmers and increase the cost towards plant protection. The damage level, direct and indirect yield loss, association with shoot and fruit borer L. orbonalis and management strategies should be studied in detail before this pest attains major pest status in brinjal.
Keywords: district / brinjal / Noticed / Dharmapuri / occurrence of flower chafer beetle

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