Effect of pigeon pea intercropping or shading with leucaena plants on the occurrence of the coffee leaf miner and on its predation by wasps in organic coffee plantings

ABSTRACT: The infestation of coffee leaf miner and its predation by wasps were assessed in commercial organic coffee plantings shaded with leucaena or intercropped with pigeon pea. Plantings in northern Paraná were assessed every two weeks from June 2011 to December 2012. The percent of infested leaves, number of mines per leaf and the percent of predation by wasps (indicated by lacerations) were determined. Fewer coffee leaf miners and fewer mines per leaf were found in pigeon pea intercropped plantings (28.4% and 0.3, respectively) than in shaded plantings with leucaena (48.1% and 0.8, respectively). More predation by wasps was found in the shaded (27.2%) than in the intercropped (13.2%) plantings. Suggestions for new studies are presented along with suggestions for managing the leaf miner in coffee plantings.

摘要：本研究针对采用银合欢（leucaena）遮阴或与木豆（pigeon pea）间作的商业化有机咖啡种植园，开展了咖啡潜叶蛾（coffee leaf miner）侵染状况及其被寄生蜂捕食情况的评估。评估于2011年6月至2012年12月期间，在巴西巴拉那州（Paraná）北部每两周进行一次。本研究测定了受侵染叶片占比、单叶潜道数，以及以蛀伤痕迹为判定依据的寄生蜂捕食率。结果表明，木豆间作种植园的咖啡潜叶蛾种群密度及单叶潜道数均低于银合欢遮阴种植园：前者分别为28.4%和0.3，后者分别为48.1%和0.8。银合欢遮阴种植园的寄生蜂捕食率（27.2%）高于木豆间作种植园（13.2%）。本文同时给出了咖啡种植园潜叶蛾的防治建议，并提出了未来新研究的方向。