Abstract
In recent years, a kind of mulberry pests which were known as the mulberry gall midge Cotarina sp. in different mulberry planting areas occurred popularly in China. This study aims to screening high efficacy and low toxicity insecticides for controlling Cotarina sp.. The current study can help understand integrated pest management (IPM) of Cotarina sp. by scientific and reasonable insecticide use. Field experiment was carried out to investigate eight insecticides, treated with 3 concentration gradients. The result shows that Imidacloprid, Thiamethoxam, Cyromazine, Bifenthrin and Cypermethrin·Profenofos had high control effect on the mulberry gall midge.Their pesticide residues were all less than Chinese Standard GB2763-2016, which means that they were feasible to control this pest. This paper shows that, to control Cotarina sp. in fruit mulberry production, 10% Imidacloprid WP with 2000~3000 dilution and 25% Thiamethoxam WDG with 1500~2500 dilution and 80% Cyromazine WDG with 1500~2000 dilution are the best. 2.5% Bifenthrin EW with 1000~1500 dilution and 440g/l Cypermethrin·Profenofos EC with 1000~2000 dilution should be used by selection. However, Bifenthrin or Cypermethrin·Profenofos cannot be used in mulberry field for both fruits and leaves, so as to avoid causing silkworm poisoning.
Highlights
Cotarina sp. (Diptera: Nematocera: Cecidomyiidae) is the main pest on mulberry[1], known as mulberry fruit gall midge, first discovered in the 1980s, and distributed in the Guangzhong area of Shaanxi in China[2]
The results showed that they had certain control effect on Cotarina sp
The control efficacy of 10% imidacloprid WP, 25% Thiamethoxam WDG and 80% Cyromazine WDG was significantly higher than that of control group. 10% imidacloprid WP and 25% Thiamethoxam WDG, of which the correction control effects were more than 97%, no significant difference between different concentrations, significantly higher than that of other insecticides, gained the best control effects against Cotarina sp.. 80% Cyromazine WDG was significant difference between 1500 times solution and 2000~2500 times solution
Summary
Cotarina sp. (Diptera: Nematocera: Cecidomyiidae) is the main pest on mulberry[1], known as mulberry fruit gall midge, first discovered in the 1980s, and distributed in the Guangzhong area of Shaanxi in China[2]. (Diptera: Nematocera: Cecidomyiidae) is the main pest on mulberry[1], known as mulberry fruit gall midge, first discovered in the 1980s, and distributed in the Guangzhong area of Shaanxi in China[2]. Mulberry fruit gall midge and mulberry fruit sclerotiniosis are commonly known as "one disease and one worm"[5]. Zhisong Xia (2005) reported that the mulberry fruit gall midge made serious damages in Sichuan-Shaanxi area. The damage rate of mulberry fruit was as high as 90%[6]. Few studies have been done on the control of mulberry fruit gall midge. This study is carried out screening of high-efficiency and low-toxicity insecticides for controlling Cotarina sp., providing the theory basis for resolving the problem of the pest in scientific, proper, economical and effective ways
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