Forecasting the Occurrence of Young Japanese Mealybug Larva <i>Planococcus kraunhiae</i> (Kuwana) (Hemiptera: Pseudococcidae) Using Sex Pheromone Traps and Total Effective Temperature for Persimmon

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  • 性フェロモンと有効積算温度を利用したカキのフジコナカイガラムシ（カメムシ目：コナカイガラ科）幼虫の発生時期予測
  • 性フェロモンと有効積算温度を利用した力キのフジコナカイガラムシ(カメムシ目:コナカイガラ科)幼虫の発生時期予測
  • セイ フェロモン ト ユウコウ セキサン オンド オ リヨウ シタ チカラ キ ノ フジコナカイガラムシ(カメムシモク:コナカイガラカ)ヨウチュウ ノ ハッセイ ジキ ヨソク

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Abstract

We investigated the possibility of predicting the emergence of first-generation young nymphs of the mealybug Planococcus kraunhiae (Kuwana) by using effective cumulative temperature, with peak sex pheromone trap captures as a base point. Seasonal yearly fluctuations in the number of sex pheromone trap captures in four persimmon fields in Japan (Shimane, Hiroshima, Gifu, and Fukuoka prefectures) indicated that Japanese mealybugs produce three to four generations in a year. The event of the first pheromone trap captures of wild mealybugs in the present study matched with those in our previous rearing experiments in Shimane Prefecture in 2007 and 2008 using male overwintering-generation nymphs raised in a ventilated case with a meteorological gauge (Stevenson screen). The actual timing of the first-generation nymph capture using band traps matched the estimated emergence time of the first-generation nymphs, which was calculated from the cumulative effective temperature starting from the pheromone trap capture time for the over-wintering adult male bugs. Therefore, setting pheromone trap capturing peak as a base point, prediction of occurrence of first-generation mealybug nymphs is considered possible, utilizing the effective cumulative temperature for persimmon.

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