黃角小黑隱翅蟲對神澤氏葉蟎卵量的取食與產卵反應評估

Abstract

黃角小黑隱翅蟲（Oligota flavicornis (Boisduval & Lacordaire)）為葉蟎的捕食性天敵，在28℃、13:11（L：D）光周期的定溫箱中測試其幼蟲在每日供應10、20、40、80 及160 粒神澤氏葉蟎卵時的取食反應，於供應10-40 粒葉蟎卵時，70-100 %的幼蟲在完成發育之前即逃離測試浮葉。供應20-160 粒葉蟎卵時，幼蟲取食量隨食物的增加而顯著上升。每日供給160 粒葉蟎卵，80 %的幼蟲在測試浮葉上化蛹，其取食量與先前所報導生活環觀察中者相當且甚穩定。另 在相同條件的定溫箱中，每日供應20、40、80、160 及240 粒葉蟎卵以測試雌成蟲對蟎的取食及產卵反應，供應的食物愈多，雌成蟲明顯吃得愈多。供給160 及240 粒葉蟎卵時，雌成蟲的每日取食量及產卵量均與先前所報導生活史觀察中者相當，且個體間表現穩定。以此推斷黃角小黑隱翅蟲的幼蟲及雌成蟲均需有160粒葉蟎卵才能誘使其正常發育及產卵。 Oligota flavicornis (Boisduval & Lacordaire) is a predator of spider mites. Feeding response of the larval stage to the daily supply of 10, 20, 40, 80, and 160 eggs of T. kanzawai Kishida were studied at 28 oC and a photoperiod of 13:11 (L: D) in an incubator. When provided with 10, 20, and 40 spider mite eggs daily, most of the tested larvae escaped from the leaf arena before the completion of development. At the food supply scheme of 20-160 spider mites eggs the daily food consumption of the tested larvae increased significantly with the increase of food supply. With the daily offer of 160 spider mite eggs, most of the tested larvae pupated on the testing leaf arena and their daily food consumption was stable and was compatible to the feeding rate in a previous life cycle study. Feeding and ovipositing response of adult female beetles to the daily supply of 20, 40, 80, 160, and 240 spider mites eggs were also tested in incubator of the same settings. When provided with more food, the adult females consumed significantly more spider mite eggs. At the 2 higher food provision scheme, the daily feeding rate and fecundity of the adult females were stable and were compatible to those in previous life history study. One hundred and sixty spider mite eggs were considered by the authors to be the food amount to attract both of the adult female and the larvae of this beetle to feed and oviposit normally.