Aphids on Cherry Trees

Local grower Karen Egan had a question about an aphid outbreak on cherry trees.   Besides insecticidal soap, an application of neem oil could be effective.  The Neem tree (Azadirachta Indica) is an evergreen and native to India.  The product comes in several dilution rates.  Orchardist Michael Phillips prefers 100% neem that is available online from different sources.  Care must be taken when using because the oil is very thick.  Use warm water and add a liquid soap as an emulsifier.  The neem must be thoroughly diluted or phototoxicity can occur, causing the leaves to burn.
Also beneficial insects can be ordered that attach aphids. Check out http://www.ipmlabs.com and http://www.biconet.com for more information.