Electrophysiological Response of Two Moth Species, Helicoverpa armigera and Maruca vitrata to Host Plant ( Cajanus cajan
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Electrophysiological Response of Two Moth Species, Helicoverpa armigera and Maruca vitrata to Host Plant (Cajanus cajan) Volatiles Suresh M. Nebapure1
Received: 28 June 2018 / Revised: 9 January 2020 / Accepted: 11 January 2020 The National Academy of Sciences, India 2020
Abstract Host searching and oviposition behavior of insects are influenced by certain plant volatiles which help, especially, gravid females to locate suitable oviposition site. To ascertain the differential behavior, if any, electrophysiological response of two moth species Helicoverpa armigera and Maruca vitrata to the volatiles of their common host, i.e., pigeon pea, was studied. Dynamic headspace collection of volatiles from pigeon pea revealed the presence of 27 volatiles belonging to different classes such as aliphatic hydrocarbons like undecane, dodecane, and tetradecane, green leaf volatiles like (Z)-3-hexen-1-ol acetate and (E)-2-hexen-1-ol acetate, aromatics like acetophenone, an acyclic sesquiterpenes alcohol like farnesol, a cyclic monoterpene like limonene, bicyclic sesquiterpenes like caryophyllene and its oxide and a monoterpene like (z)-b-ocimene. Electroantennogram response of selective volatiles revealed the significant difference between the responses from gravid females of both species suggesting difference in perception of odor by both the insect species. At lowest concentration used (0.1 mg/ml) there was a significant response to phenylacetaldehyde and b-caryophyllene at 5% level of significance, whereas it was significant at both 1% and 5% level of significance for linalool, limonene and b-myrcene. Phenylacetaldehyde and limonene triggered significant response in H. armigera, whereas in M. vitrata phenylacetaldehyde and b-myrcene elicited the significant response.
& Suresh M. Nebapure [email protected] 1
Division of Entomology, Indian Agricultural Research Institute, New Delhi 110 012, India
Keywords Pigeon pea Volatiles Helicoverpa armigera Maruca vitrata Electroantennogram
Pod borer complex in pigeon pea is one of the important constraints in cultivation of pigeon pea, Cajanus cajan. The spotted pod borer, Maruca vitrata is becoming a serious pest along with Helicoverpa armigera in recent times. Females of Maruca lay the eggs on buds, flowers and young pod, and larvae after hatching start feeding on developing buds, flowers and young pods by webbing and concealing themselves; and this feeding habit escapes them from insecticides and from predators which ultimately leads to its dominance. Helicoverpa armigera females lay eggs singly on buds and developing pods and causes damage to flower buds and pods. This pest has developed resistance to many insecticides which makes difficult to manage it. Under this scenario, pest management strategies based on semiochemicals are must and will play indispensable role in days to come. Plant volatiles and flower volatiles are important cues for insects for locating host plant, oviposition, and mate finding [1–3]. The aim of this study was to underst
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