Abstract
The brinjal shoot and fruit borer, Leucinodes orbonalis is a destructive pest of brinjal and its control is difficult as the larvae inhabited inside the shoots or fruits of brinjal. Two different studies were conducted in farmer’s field at Coimbatore, Tamil Nadu, India during Rabi 2013/14 (September, 2013 – January, 2014) and 2014/15 (September, 2014 – January, 2015) to evaluate the efficacy of 1) types of traps viz., sleeve and Wota-T traps, and erection heights viz., 30, 60, 90 cm above the crop canopy and at crop canopy level, and 2) concentration of lure viz., one, two and three mg (Lucin-lure®), and frequency of replacement of lure viz., 21, 45 and 60 days. The results showed that the Wota-T traps baited with 3 mg lure concentration, replaced at every 21 days caught more number of male moths of L. orbonalis. Trap catch was significantly higher in pheromone traps placed in the same level of canopy.
Highlights
The brinjal shoot and fruit borer, Leucinodes orbonalis (Guenée)(Lepidoptera: Crambidae) is the most noxious and destructive pest of brinjal and widely distributed in South Asian countries (Talekar, 2002)
Orbonalis is fairly possible when the spraying of pesticides was occurred before the neonate larvae bore inside shoots or fruits; once in the shoots or fruits, larvae are inaccessible to the killing action of surface applied chemicals
The lowest moth catches were observed in 90 cm above the canopy level (7.08 and 3.08 moth catches/trap in Wota-T traps and sleeve traps, respectively)
Summary
The brinjal shoot and fruit borer, Leucinodes orbonalis (Guenée)(Lepidoptera: Crambidae) is the most noxious and destructive pest of brinjal and widely distributed in South Asian countries (Talekar, 2002). The management of this pest is difficult as its larvae inhabit inside the plant’s shoots or fruits by forming tunnels (Alam et al, 2003) and the pesticide do not reach the pest directly. The control of L. orbonalis is fairly possible when the spraying of pesticides was occurred before the neonate larvae bore inside shoots or fruits; once in the shoots or fruits, larvae are inaccessible to the killing action of surface applied chemicals. Since neonate larvae can enter fruits or shoots within only a few hours of hatching from eggs, pesticides have to be applied frequently in order to have sufficient toxic residues on the plant surface adequate enough to kill the crawling larvae (Alam et al, 2003). The frequent application of insecticides is not advisable when the crops are in fruiting stage
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