Biology and management of woolly apple aphid , Eriosoma lanigerum ( Hausmann ) , in Washington state

Content Provider	Semantic Scholar
Author	Beers', S. D. Cockfield' E. H.
Copyright Year	2008
Abstract	Woolly apple aphid. Eriosoma lanigerum (Hausmann) (Homoptera: Aphididae) has become a more severe pest in Washington apple production in the past few years. Milder winters have promoted overwintering survival on the aerial parts of the tree. A very low percentage of the current apple acreage is planted on resistant rootstocks, nor are such rootstocks used for new plantings. The transition from organophosphate insecticides to either insect growth regulators or neonicotinyl insecticides may also be contributing to higher pressure. In addition, this pest became one of quarantine concern in 2006. Alternatives to organophosphate pesticides have been tested for several years. Of these, petroleum oil shows some promise, as does a particle film used for sunburn protection. A neem-based insecticide provided temporary suppression, as did several neonicotinyl insecticides. A second approach to management, that of controlling the root colonies, was explored for the first time in this region. In potted tree assays, several compounds including imidacloprid, spirotetramat and oxamyl showed good root and systemic activity: in field trials, however, results were more variable. A greenhouse test of 8 clonally propagated rootstocks and 2 seedling rootstocks demonstrated that several of the new Geneva rootstocks to have virtual immunity to a Washington strain of woolly apple aphid, whereas the older Malling-Merton rootstocks had a lesser degree of antixenosis.
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://naldc.nal.usda.gov/download/20064/PDF
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article