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Damage, Occurrence, and Optimal Control Period of Eurytoma maslovskii Affecting Japanese Apricot (Prunus mume) Fruits in Jeonnam Province
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 Title & Authors
Damage, Occurrence, and Optimal Control Period of Eurytoma maslovskii Affecting Japanese Apricot (Prunus mume) Fruits in Jeonnam Province
Choi, Duck-Soo; Ko, Sug-Ju; Ma, Kyeong-Cheul; Kim, Hyo-Jeong; Kim, Do-Ik; Kim, Hyeun-Woo;
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 Abstract
Fruit drop due to Eurytoma maslovskii infestations of Japanese apricot (Prunus mume) is a serious economic issue in most parts of Jeonnam Province, with the exception of the coastal areas such as Wando, Shinan, Yeosu, and Muan. The average incidence of fruit drop was 67% in 2013 and 33.3% in 2014. E. maslovskii larvae overwinter inside the pits of Japanese apricots. Larval survival rates decrease to less than 30% after a rainy summer season. The eggs are long oval of 0.68 mm, 0.29 mm and ivory white. Mature larva is of 6.56 mm, 3.18 mm. Free pupa are black, adult females and males of 6.97 mm, 4.90 mm lengths, respectively, while the ovipositor is 0.64 mm in length. Adult emergence occurs from early April to early May, when Japanese apricot fruits are from 4 mm to 17 mm in diameter. Adults persist for 13.5 d after emergence, and the sex ratio of females to males was found th be 45.9:54.1. Although up to four eggs may be oviposited per fruit, only one larva will ultimately survive, ans the larvae are cannibalistic. The period during which E. maslovskii is able to oviposit on Japanese apricots only lasts from mid- to late April (fruit diameter: 12~16 mm). When the diameter of the fruit is >16 mm, the pit of the Japanese apricot hardens and larvae have difficultly penetrating the stone. Therefore, the most effective method of controlling this pest is to spray orchards with a control agent 2~3 times, at 5 d intervals, beginning in mid- April.
 Keywords
Prunus mume;Eurytoma maslovskii;Occurrence;Optimal control period;
 Language
Korean
 Cited by
 References
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