Impact of Pesticidal Spray on Seasonal Availability of Natural Predators and Parasitoides in the Tea Ecosystem


  • CSK Himachal Pradesh Krishi Vishvavidyalaya, Department of Entomology, H. P., 176 062, India


Tea plant (Camellia sinensis (L.) O' Kuntze) is attacked by numerous insect pests, which causes considerable damage to the quality and quantity of tea. The most important pest attacking tea bushes in H. P. are purple mite, Calacarus carinatus (Green), thrips, Scirtothrips dorsalis Hood, leafroiier, Gracilaria theivora, Walsom, apbid, Toxoptera aurantii Boyer, mealybug, Nipaecoecus sp. and leafminer, Tropiomyts theae (Cotes). The important natural enemies associated in the tea orchards are Syrphis sp., Coccincella septempunctata Linn., Oxyopes sp. and parasitoid, Diaeretiella sp. Among the insecticides and biopesticides evaluated against natural enemies, deltamethrin, cypermethrin and ethion sprays were found highly toxic to Syrphis sp. and C. septempunctuata and their adult and larval population was not seen even on 7th and 4th days of spray, respectively. Neemark, Achook and B.t. (Dipel 8L) were quite safe to natural enemies. Endosulfan was relatively safe to Syrphis sp. but highly toxic to C. septempunctata.


Insect-Pests, Pesticidal Effects, Predators, Parasitoids, Predation Potential, Tea Ecosystem.

Subject Discipline

Agriculture Sciences

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