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Navarajan Paul, A. V.
- Effect of Sensitization on the Orientation Response of Cotesia plutellae Females towards the Odour of Cruciferous Host Plant and Host Larval Body Extracts
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PDF Views:134
Authors
Affiliations
1 Division of Entomology, Indian Agricultural Research Institute, New Delhi 110 012, IN
1 Division of Entomology, Indian Agricultural Research Institute, New Delhi 110 012, IN
Source
Journal of Biological Control, Vol 24, No 3 (2010), Pagination: 210-217Abstract
The importance of odour learning in host habitat and host selection is well demonstrated in many insects. In this present study using Cotesia plutellae Kurdjumov as a model, we examined the capacity of naive C. plutellae females to learn and orient towards the odour of cruciferous host plant, host larval body extracts of Plutella xylostella (L.), larvae reared on different host plants in a 'Y' tube olfactometer by repeated exposure. The acquired capability to recognize an odour by repeated exposures (sensitization) to a particular odour produced a strong decline in orientation time of wasps to the odour source. The decline in orientation time at 5th exposure level was at least 55% and 36%, respectively, for virgin and gravid females to HPLE odours in relation to first exposure level. Whereas the HLBE odours elicited 49% and 51% decline in orientation time, respectively in virgin and gravid females compared to 1st exposure level. Briefly, the gravid females oriented much faster toward larval body odours compared to host plant odours; while, virgin females were more attracted and rapidly oriented to host plant odours compared to larval body odours, signifying some synomonal/kairomonal substances are involved in influencing the orientation. The rapid orientation response observed for various infochemical extracts demonstrate that C. plutellae upon sensitization can respond to the chemical signals of most preferred odour in a host plant-herbivore complex associated with cruciferous crop ecosystem.Keywords
Sensitization, Cotesia plutellae, Plutella xylostella, Brassicaceae, Host Plant Extracts, Larval Body Extracts, Y-tube Olfactometer, RM-ANOVA, Learning, Orientation Time.Full Text
- Differential Parasitism by Cotesia plutellae (Kurdjumov) on Plutella xylostella (L.) in Artificially Infested Host Plants
Abstract Views :217 |
PDF Views:119
Authors
Affiliations
1 Division of Entomology, Indian Agricultural Research Institute, New Delhi 110 012, IN
1 Division of Entomology, Indian Agricultural Research Institute, New Delhi 110 012, IN
Source
Journal of Biological Control, Vol 24, No 1 (2010), Pagination: 22-27Abstract
The parasitic potential of Cotesia plutellae (Kurdjumov) on diamondback moth larva was studied under laboratory and field conditions. The results revealed that the parasitism under field conditions was 27% lower than the caged laboratory conditions. Cauliflower, cabbage and mustard plants were more attractive to the gravid females establishing 56%, 53% and 45% parasitism, respectively, compared to other tested host plants. These were followed by Brussels sprout and broccoli. Lowest level of parasitism was recorded in knol-khol and kale under both field and caged laboratory conditions. The role played by host plants, herbivore induced volatiles and larval byproducts as well as the phyllotaxy of host plants in sheltering the host larvae are implicated for the observed variation in parasitism and discussed in a tri-trophic context.Keywords
Cotesia plutellae, Larval Parasitoid, Parasitism, Plutella xylostella, Field Efficiency, Host Plant Volatiles, Biological Control.Full Text
- Orientation and Behavioural Responses of Cotesia plutellae Kurdjumov (Hymenoptera: Braconidae) to Cruciferous Host Plants and Host Larval Body Extracts
Abstract Views :262 |
PDF Views:174
Authors
Affiliations
1 Division of Entomology, Indian Agricultural Research Institute, New Delhi 110012, IN
1 Division of Entomology, Indian Agricultural Research Institute, New Delhi 110012, IN
Source
Journal of Biological Control, Vol 23, No 4 (2009), Pagination: 365-373Abstract
The foraging activity of a parasitoid is highly influenced by the chemical cues released from the host plants and their potential hosts in a cropping system. The larval parasitoid Cotesia plutellae parasitizes the diamondback moth (DBM), Plutella xylostella most efficiently in cruciferous crop ecosystems throughout the world. In this study, we have evaluated and report the effect of hexane extracts of certain selected host plants and larvae of DBM reared on these host plants on the odour preference and orientation behaviour of C. plutellae using multi-armed olfactometer and Y-tube olfactometer. The orientation response indicated that host larval body extracts were more attractive and stimulatory to host seeking females than host plant leaf extracts at 1% concentration. Gravid females responded in relatively larger numbers to both host larval body and host plant leaf extracts compared to virgin females. These extracts could be used to enhance the foraging ability of C. plutellae to contain the menace of diamondback moth in cruciferous crop fields.Keywords
Cotesia plutellae, Plutella xylostella, Orientation Response, Host Plant and Host Larval Body Extracts, Foraging Ability, Olfactometer, Integrated Pest Management.Full Text
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