White cotton-like growth on apple trees?

This cottony growth is due to the sap-sucking insect known as woolly aphid. The weather pattern this year is very conducive for outbreaks of woolly aphids. Severe infestation can cover the whole tree and manual destruction is not feasible. If only a few colonies are observed, rub them off using a wet cloth or strong jet of water. During severe infestation/outbreak, please contact NPPC at 02-351016 or Mr. Tshelthrim Zangpo at 77732252 or email us at nppcsemtokha@gmail.com for advice on management. You can also visit our website at https://pestsofbhutan.nppc.gov.bt/crop-and-pest-identification/insects/woolly-aphid/ for further detail of the pest.