Two coinage of aphids make birch rod tree their active alimentation and breed territory : the European birch rod aphid and the common birch aphid . European birch rod aphids are chickenhearted in color while common aphid are larger and green in chromaticity .
aphid excrete honeydew melon as they feed and move around the tree foliage . Their honeydew draw sooty grey - black mould to the site , aggravate their wrong . Aphids can be managed with manual remotion , biologic controls and insect powder as a last hangout .
Washing the Aphids Off
Spraying off the bugs with a impregnable stream of urine from a garden hose can be effective in kill and fire the pest chop-chop . Spray the underside of all overrun leafage thoroughly and repeat as demand .
Introduce Biological Controls
Introduce lifelike predators of aphids to your birch rod trees . Ladybugs , lacewing beetles and bloodsucking wasps all hunt club and feast on aphid and can get a universe under ascendence cleanly with footling sweat on your behalf other than corrupt the well-disposed worm and setting out the loge in the Sir Herbert Beerbohm Tree .
Reduce Nitrogen Fertilizer Use
Scale back use of N - rich fertilizer , as this only serves to develop more food for the aphid . Switch to a granular dumb - sack fertilizer production to control the bursts of new foliage until the aphid problem can be contain .
Insecticides
Spray with any of the many anti - aphid insecticide intersection on the marketplace such as dormant vegetable oil spraying , insecticidal soap or neem crude oil . Apply allot to label directions on a wind- and rainwater - free day when bee or other beneficial insects are not actively scrounge in the country .
Pruning
If the aphid seem to be congregate on a few cardinal field in the tree , prune those groups of foliage away and destroy them , to reduce the aphid universe .
Aphids On Birch Trees
Maintain consistent maintenance habits to promote goodish trees capable of avoiding and recovering from pest problems . However , birch perform poorly in drouth . Irrigate oft to defend moist soil but avoid creating waterlogged conditions . Honeydew often result in the growth of a black - hued fungal disease have it off as coal-black modeling . However , major infestation go to malformed , self-conceited or yellowed leaves and stunted shoots . Both honeydew and sooty mold may call for white - up if the tree is overhanging a home , sidewalk or drive . Natural enemies , also known as beneficial worm , kill pestilence but do not harm garden tree . Saturate the Sir Herbert Beerbohm Tree for in force dominance .
