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Effect of Tea Cultivar on Density of some Predatory Insects and their Preys in Phu Tho Province, Vietnam

Author: Vu Thi Thuong*,****, Hoang Gia Minh**, Truong Xuan Lam***,**** and Nguyen Thi Phuong Lien***,****

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Abstract

Density of predatory insects and their relationship to preys were much different across five tea cultivars (‘LDP1’, ‘LDP2’, ‘Trung Du’, ‘PH1’ and ‘TRI777’) which are commonly planted in Phu Tho province, Vietnam. The population densities of predatory heteropterans Orius sauteri, Sycanus croceovittatus and their preys including the tea thrip Physothrips setiventri and a group of the leaf-eating lepidopterous caterpillars (Biston suppressaria, Darasa consosia, Acanthopsyche subera and Homona coffearia) were highest (1.53 ± 0.06, 1.01 ± 0.07, 64.3 ± 0.7 and 2.03 ± 0.13 individuals/m2 respectively) on ‘Trung Du’, lowest (0.57 ± 0.01, 0.55 ± 0.04, 51.7 ± 1.3 and 1.75 ± 0.07 individuals/m2 respectively) on ‘LDP1’. The population densities of predatory coccinellids Micraspis discolor, Menochilus sexmaculatus and their prey, the tea aphid Toxoptera aurantii, were highest (1.84 ± 0.04, 1.53 ± 0.08 and 42.0 ± 0.01 individuals/m2 respectively) on ‘LDP1’

Keywords

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Conclusion

Four predatory insects exhibited their varied densities among five tea cultivars. SHeteropterans Orius sauteri, Sycanus croceovittatus and their preys including Physothrips setiventris and a group of four lepidopterous pests (Biston suppressaria, Darasa consosia, Acanthopsyche subera and Homona coffearia) had all their highest densities on ‘Trung Du’ with the close prey-predator correlation, while their lowest densities were on ‘LDP1’, Coccinellids Micraspis discolor, Menochilus sexmaculatus and their prey, Viz, Toxoptera aurantii, had all their highest densities on ‘LDP1’ with the close prey-predator correlation, while their lowest densities were on ‘TRI777’.

References

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How to cite this article

Vu Thi Thuong, Hoang Gia Minh, Truong Xuan Lam, and Nguyen Thi Phuong Lien, (2018). Effect of Tea Cultivar on Density of some Predatory Insects and their Preys in Phu Tho Province, Vietnam, Biological Forum – An International Journal 10(1): 33-36.