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Journal of Entomology and Zoology Studies
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ISSN Print: 2349-6800 | ISSN Online: 2320-7078

Journal of Entomology and Zoology Studies

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2017, Vol. 5, Issue 3
Studies on the presence of Semiochemicals E-β-Farnesene (EBF) from Aphis craccivora (Koch), Gujarat, India

Ruchika Kataria and Dolly Kumar

The Aphids, Aphis craccivora (Koch) is a serious pest in agricultural fields of Vadodara. In an attempt to find the solutions to reduce the infestations by this pest, study was carried out on the aphid semiochemicals. The alarm pheromone of aphids was isolated by fractionation of crude pheromone extract obtained by aeration of virgin females. The pheromone was identified as mixture of sesquiterpenes compounds (E-β-farnesene), by using GC-MS. To see the effectiveness of extract, behavioural bioassays (using Y-tube olfactometer) were conducted under laboratory conditions. The results showed that the presence of semiochemicals as alarm pheromones in the female volatile extract which could repel its own species and other species while it attracts the predators and other associated natural enemies. The repulsive index (RI = 97.08; 92.25 and 81.73 for A. craccivora and A. gossypii & A. nerii) and attractive index (AI = 0.054, 0.025 for C. septempunctata and C. compressus) were calculated. The responsiveness (χ2 values – goodness of fit) against extract {for finding significant values S*= 0.009; 0.030, 0.001 & S*= 0.024; 0.035} was calculated to provide strong evidence for the presence of alarm pheromones. Hence the information contained in this paper pave way to the identification of proper management practices to maximize lure methods during effective reproductive period.
Pages : 120-129 | 460 Views | 26 Downloads
How to cite this article:
Ruchika Kataria and Dolly Kumar. Studies on the presence of Semiochemicals E-β-Farnesene (EBF) from Aphis craccivora (Koch), Gujarat, India. 2017; 5(3): 120-129.
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