Effect of Different Plant Extracts Against Pink Bollworm, Pectinophora gossypiella (Saund.) Larvae on Bt. and Non-Bt. Cotton
Effect of Different Plant Extracts Against Pink Bollworm, Pectinophora gossypiella (Saund.) Larvae on Bt. and Non-Bt. Cotton
Imran Ali Rajput1*, Tajwer Sultana Syed1, Ghulam Hussain Abro1, Imran Khatri1 and Abdul Mubeen Lodhi2
ABSTRACT
The frequent use of pesticides at repetitive application have increased the input cost of local farmer and similarly aroused the serious problem of pest resistance. The introduction of transgenic cotton since last decades has played a significant role in suppressing the pest population of Pectinophora gossypiella (Saund) which is the main pest of cotton in all over the world. Nevertheless, the indigenous botanical extracts have been used effectively against various sucking pests of cotton but only few studies have been attempted to observe their action against bollworms. Therefore, the present study has been designed to observe the dual action of transgenic cotton and botanical extracts against pink bollworm during two consecutive growing years (2015 and 2016). The three local extracts such as tobacco (Nicotiana tabacium), neem (Azadirachtin indica) and datura (Datura stramonium) were used in traditional method. The overall results showed that the sprays at different interval indicated the highest pest population reduction at tobacco (17.45-15.09%) followed by neem (14.58-15.33%) and datura (11.72-7.81%) in both varieties and similar trend was also noted in the second year of the study. The effect of varietal difference of Bt. and non-Bt. cotton varieties was not much recorded in the 2015 but later in 2016 the dual effect of tobacco and Bt. cotton on larval population was noticed. The bio-extracts were much effective until 48 hrs, which indicated that these bio-pesticides need to spray repeatedly. The present study suggested that these bio-extracts are useful in controlling the pest problem without destroying the natural enemies and environmental hazards.
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