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The Spotted Tentiform Leafminer (''Phyllonorycter blancardella'') is a moth of the Gracillariidae family. It is known from all of Europe, east to Ukraine and central Anatolia. It is also known throughout North America including Nova Scotia, Quebec, Ontario, Wisconsin and California. The wingspan is 6–9 mm. Adults emerge in May and again in August in two generations in western Europe. The larvae feed on ''Malus angustifolia'', ''Malus x astracanica'', ''Malus baccata'', ''Malus coronaria'', ''Malus domestica'', ''Malus floribunda'', ''Malus fusca'', ''Malus ringo'', ''Malus x robusta'' and ''Malus sylvestris''. They mine the leaves of their host plant. The mine has the form of a lower surface tentiform mine. The epidermis is yellow-green and has some folds. Pupation takes place within the mine. The pupa is amber or chestnut brown, and is made within a white cocoon. ==Control of ''P. blancardella''== The Spotted Tentiform Leafminer is a serious pest of various apple species (Malus), along with the Apple Blotch Leafminer moth (''Phyllonorycter crataegella'') and others. Infestation may result in reduced crop yield. Both species, like many other pests, show an increasing resistance to organophosphate and synthetic pyrethroid insecticides. Two species of very small wasps, the eulophid ''Sympiesis marylandensis'' and the braconid ''Pholetesor ornigis'' are parasites of both ''P. blancardella'' and ''P. crataegella''. Biological control includes reducing the use of broad spectrum insecticides, helping these and other parasitoids to flourish and reduce leafminer damage. Mulching fallen leaves may also allow fragments to be pulled underground by earthworms.〔 ((see also Part 2) )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Phyllonorycter blancardella」の詳細全文を読む スポンサード リンク
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