Development And Application Of Termite Bait For Controlling Ancistrotermes Dimorphus Tsai Et Chen(Isoptera:Termitidae)

Recently, damage of termite in the chestnut forest and the sugarcane fields, which located at Long’an and Chongzuo in Guangxi, has caused a great economic loss, especially for Ancistrotermes dimorphus Tsai et Chen (Isoptera:Termitidae). In this thesis, effects of19kinds of baits and8kinds of insecticides on A. dimorphus were evaluated, and the optimal bait and insecticide were selected. Efficient and environment-friendly bait packages were manufactured based on these optimal materials. The main results were summarized as follows:1. Baits testingRelative response rates and feeding amounts of termite to the19kinds of materials and4mixed baits were tested in the laboratory. Subsequent experiment of feeding amounts was conducted in the field based on the7kinds of baits preferred by this species in the laboratory. Results showed that bamboo shellⅢ powder was the best bait to A. dimorphus, which can be used as poison bait.2. Flavouring agent screeningFeeding amounts of termite to bamboo shell powder with5,10, and15%sugar content were studied in the field. Results indicated that a flavouring agent plays an important role in the field, in which cultivated crops with lower sugar content. Pure flavouring agent (bamboo shell powder) has an obvious attraction effect in the field, in which cultivated crops with higher sugar content.3. Insecticides screeningAntifeeding effect of8kinds of insecticides to this species was estimated. Sulfluramid and Fipronil (≤100mg/kg) had apparently repellent effect to A. dimorphus compared with others, which were not repellent effect to this species.Stomach poisoning effect of6kinds of insecticides was examined to A. dimorphus in the laboratory. Results illustrated that the maximum toxicity of the6insecticides was Fipronil, followed by Chlorfenapyr, Flursulamid, Abamectin, Sulfluramid, and Hydramethylnon. LC50were21.44,51.75,64.75,86.55,93.75, and15538.25mg/kg.The6kinds of insecticides have different toxicant transmitting effect in A. dimorphus. The transmitting ratios of Abamectin, Sulfuluramid, Fipronil, Hydramethylnon, Flursulamid, and Chlorfenapyr were0.83,1.17,2.17,0.22,1.89, and2.01in the concentration of200,500,100,5000,1000, and200mg/kg.Hexaflumuron has significant stomach poisoning effect to nymph in A. dimorphus. The optimal concentration of this insecticide was5000mg/kg. Meanwhile, this concentration has no repellent effect to ergate.Data showed that the Flursulamid and Chlorfenapyr mixture has no evident synergistic effect to A. dimorphus. Hexaflumuron, Flursulamid, and chlorfenapyr mixture has toxic effect to A. dimorphus.Above all, Flursulamid and Chlorfenapyr can be used as materials for the bait in theory. However, we had to abandon the Flursulamid due to the high concentration and prices.4. Recommended ratio of baitsWe recommended that10%sugar,100mg/kg Chlorfenapyr,5000mg/kg Hexaflumuron, and the rest amount of the bamboo shell Ⅲpowder (powder fineness>40meshes) could be mixed and applied in the field, where cultivated crops with lower sugar content.5. Preparation of bait packageThorough stirring is essential for all materials in the mixer when components of the bait were prepared. Powder of the mixture placed into the filter bag after stirring.6. Field applicationField application test showed that the control efficiency was89.3%at Qiaojian Town and91.5%at Tuolu Town. So the bait package can be a kind of product for development and forthputting to prevent A. dimorphus.