Ovipositional characteristics of Ricanula sp. and development of its standardized forecasting method

다국어 초록 (Multilingual Abstract)

Recently an outbreaked pest belongs to Hemiptera: Recaniidae, Ricanula sp. is greatly concerned about the outspreading throughout the South of Korea by wide range of host, including Cornelian cherry, Jujube, and peach trees. In Chungbuk province, this pest was first occurred at Jincheon and Okcheon in 2012, Cheongju in 2013 and now found out at Eumseong and Goesan in 2015. Ricanula sp. was oviposited directly into one-year twig, did damages on fruit-bearing formation and finally withered the host. This study was performed to understand the ovipositional characteristics and to develop the standardized forecasting method. Oviposition by Ricanula sp. was abundant in tree than in bush, adult laid eggs on new inner twigs and then covered with wax compound. Total no. of oviposited egg-mass was 10 to 318, and that of on new twig was 5 to 185 per tree, with different to host trees. Thickness of oviposited twigs were done within 2 ~ 5.5 mm and the height was mostly founded with range of 1 to 2 m, founded with highest height over 3 m. Oviposited no. of egg-mass within 30 cm twig was appeared differently from 2 to 7 every host. From based on this investigated result, we provide this for standardized forecasting method. This pest will need to control when egg-mass will occur over 2 at new twig, within 30 cm from the tip, set as total 25 point/ 5 plants (5 point per plant).