Departmental Bulletin Paper Optimum Spray Method for Paprika Cultivation Sites under Structure and Pest Control Effects According to Spray Water Volumes

Jin, Na Young  ,  Lee, You Kyoung  ,  Lee, Bo Ram  ,  Kim, Yu Seop  ,  Kim, Hee Ji  ,  Kim, Young Shin  ,  Lim, Chi Hwan  ,  Youn, Young Nam  ,  Yasunaga-Aoki, Chisa  ,  Yu, Yong Man

61 ( 1 )  , pp.95 - 101 , 2016-02-29 , Faculty of Agriculture, Kyushu University
ISSN:0023-6152
NCID:AA00697606
Description
Pesticides were sprayed on a paprika cultivation site under structure using two types of sprayers (a remote control sprayer and a U–shaped sprayer). Next, the impact of the amount of pesticide used, the amount of active components, and spray water volumes on pest control were reviewed. As representative pests that are not easily controlled in cultivation sites under structure, two species of pests (Bemisia tabaci and Frankliniella occidentalis) were used. When the pesticide Pyrifluquinazon 10% WG was sprayed using remote control sprayers, particularly in the case of B. tabaci, a control value of 82.5% was identified when water–sensitive paper discolored into blue in the entire experimental plot. A control value of 42.6% was shown when water–sensitive paper discolored into blue in approximately a half of the experimental plot. However, the presence of pests increased greatly before the pesticide was sprayed in dead zones where the pesticide was not attached to the plant. Meanwhile, an experiment to discover the optimum pesticide spray volume with the use of U–shaped sprayers was conducted with ten paprika plants. In cases in which 5 L of Pyrifluquinazon 10% WG were applied as a pesticide, the B. tabaci control effect was 100%. Additionally, 2.5 L of the pesticide solution, which is one–half in volume, also showed 100% efficiency in controlling B. tabaci. In the case of F. occidentalis, when 5 L of Spinetoram 5% WG, Cyantraniliprole 5% EC, and Abamectin 1.8% EC were sprayed, control effects of 91.6%, 83.2%, and 82.8% were found, respectively. When the volume of the pesticide solutions was reduced to 2.5 L, control effects similar to those of 5 L were shown, reaching 95.6%, 80.4%, and 86.8%, respectively. The residual amounts of active components attached to paprika leaves averaged 5.36 (μg/50 cm^2) in the case of Abamectin 1.8% EC and 28.80 (μg/50 cm^2) in the case of Spinetoram 5% WG.
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http://catalog.lib.kyushu-u.ac.jp/handle/2324/1564088/p095.pdf

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