Predation of Diaphania indica Larvae by Arma chinensis
Diaphania indica Saunders is one of the most important pests in cucurbitaceae vegetables.Arma chinensis Fallou is a powerful predator which can feed on agricultural and forestry pests.The predation capability of A.chinensis to D.indica was studied by measuring the predation potential of the 3rd and 5th A.chinensis nymphs to the 3rd and 5th D.indica under different densities at 27℃in the laboratory and fitting the data with the functional response model.The results showed that the predation functional response of different A.chinensis nymphs to different D.indica larvae all fitted well with Holling Ⅱ model.The predation amount increased with the increase of the pest density,but showed a slowed increase at higher prey density.The searching efficiency decreased with the increase of the pest density.Compared with the 3rd A.chinensis nymphs,the 5th nymphs had a higher instantaneous attack rate,shorter treatment time,more predation number and higher predation efficacy.Further,the predation functional response was better fitted to Holling II disc equation.Hence,it is suggested that the 5th A.chinensis nymphs be released in the fields to control D.indica larvae.In this study,the predation potential of A.chinensis nymphs is clarified,which provides a scientific support for the release of the predator to control D.indica larvae in fields.
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