Common species identification and growth-decline law of mosquitoes and flies damaging Pleurotus ostreatus in Nanning, Guangxi.
Objective: The present experiment was conducted to investigate species of mosquitoes and flies damaging Pleurotus ostreatus in Nanning, Guangxi as well as their annual growth and decline law, in order to provide scientific references for integrated control of these mosquitoes and flies. Method: Adult mosquitoes and flies damaging P. ostreatus were collected from some edible mushroom farms in the suburb of Nanning, Guangxi. Common species and main species of these mosquitoes and flies were identified based on morphological characterization and DNA barcode. Meanwhile, the annual quantity dynamic changes of adult mosquitoes and flies were investigated systematically by insecticidal lamp trapping method. Then, the annual population fluctuation curve was drawn to analyze their annual growth and decline law. Result: The results showed that, there were 11 common species of mosquitoes and flies damaging P. ostreatus growth in Nanning, Guangxi, belonging to 7 genera, 7 families. Of which, the populations of B. difformis, Scatopse sp. and Megaselia sp. were the most, and resulted in the most serious damages. The occurrence peak of sciarid flies appeared from middle January to middle April or late May; the occurrence peak of scatopsid flies appeared from early March or late March to late May or late June; the occurrence peak of phorid flies appeared from late January or middle February to late June. At any other time, there were very few sciarid flies and scatopsid flies to be found, while the quantity of phorid flies fluctuated at the low level. Conclusion: B. difformis, Scatopse sp. and Megaselia sp. are the main species damaging growth of P. ostreatus in Nanning, Guangxi, and there is one occurrence peak of each species population every year. Furthermore, because the peak of each species appeared in first half year, all the preparatory work on controlling should be ready in advance, and the yellow sticky trap, insecticidal lamp special for edible fungi and 4.3% beta-cyfluthrin . emamectin benzoate EC should be used to control them.