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. 2014 Jul 28:3:378.
doi: 10.1186/2193-1801-3-378. eCollection 2014.

Pigeonpea genotypes influence parasitization preference and survival and development of the Helicoverpa armigera larval parasitoid, Campoletis chlorideae

Shiddalingappa V Hugar  1 , Hari C Sharma  2 , Kondikallu Basavan Goud  3
Affiliations

Pigeonpea genotypes influence parasitization preference and survival and development of the Helicoverpa armigera larval parasitoid, Campoletis chlorideae

Shiddalingappa V Hugar et al. Springerplus. .

Abstract

Studies were undertaken to identify pigeonpea, Cajanus cajan (L.) Millspaugh and the wild relative of pigeonpea, Cajanus scarabaeoides (L.) (accession ICPW 125,) genotypes that are hospitable to the pod borer, Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) larval parasitoid, Campoletis chlorideae Uchida (Hymenoptera: Ichneumonidae) for the management of this pest in pigeonpea based cropping systems. Percentage parasitization of the H. armigera larvae by the C. chlorideae females was greater under no-choice conditions than under multi-choice conditions because of forced parasitization under no-choice conditions. Lowest parasitization was recorded on the wild relative, ICPW 125, which may be due to long nonglandular hairs and low survival of H. armigera larvae. Parasitization of H. armigera larvae was greater under no-choice, dual-choice and/or multi-choice conditions on ICPL 87, ICPL 87119 and ICPL 87091, which are susceptible to H. armigera, than on the pod borer-resistant genotypes ICPL 332WR, ICPL 84060 and ICPB 2042; while survival and development of the parasitoid was better on H. armigera larvae fed on ICPL 87, ICPL 87119, LRG 41, ICP 7035 and ICPL 87091 than on ICPL 332WR, ICPL 84060, ICPB 2042 and ICPW 125. The genotypes ICPL 87, ICPL 87119, LRG 42 and ICPL 87091 that are hospitable to C. chloridae, are better suited for use in integrated pest management to minimize the losses due to H. armigera in pigeonpea.

Keywords: Biological control; Campoletis chlorideae; Compatibility; Helicoverpa armigera; Pigeonpea; Plant resistance; Tritrophic interactions.

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Figures

Figure 1
Figure 1
Influence of different pigeonpea genotypes on parasitization of H. armigera larvae by C. chlorideae females under no-choice and multi-choice conditions. The bars followed by the same letter (upper or lower case) are not statistically significant at P ≤ 0.05. S-Susceptible, MR-Moderately resistant, R-Resistant, and W-Wild resistant.
Figure 2
Figure 2
Parasitization of 2 nd instar larvae of H. armigera by C. chlorideae females on different genotypes of pigeonpea under dual-choice conditions. The bars followed by the same letter are not statistically significant at P ≤ 0.05. RPP = Relative parasitization preference in relation to the susceptible check, ICPL 87. S-Susceptible, MR-Moderately resistant, R-Resistant, and W-Wild resistant.
Figure 3
Figure 3
Parasitization preference of C. chlorideae females towards 2 nd instar larvae of H. armigera on different genotypes of pigeonpea in relation to the susceptible check, ICPL 87 under dual-choice conditions. A pair of bars followed by the same letter are not statistically significant at P ≤ 0.05. S-Susceptible, MR-Moderately resistant, R-Resistant, and W-Wild resistant.
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