Underground colonies also form galls on the roots. A colony appears as a cottony mass generally clustered in wounds and pruning scars on the trunk and branches of the tree. A soil drench can be used on trees up to seven years old. Recipe for Resin wash: Boil 4 lbs. This aphid is found in colonies on the aerial portions of the tree and on roots during winter. The woolly apple aphid (Eriosoma lanigerum) is a major pest of apple and pear trees, forming dense colonies that feed on the plant’s roots, shoots and fruit. Apple Tree Diseases. Aphid spread . ... 1996. Galls are more visible on water sprouts than on tree wounds. Changes in orchard rootstocks (M9 and M26) and microclimate (protective canopies) have resulted in more favourable conditions for woolly aphid to prosper. The woolly apple aphid infests woody parts of apple roots and limbs, often near pruning wounds, and can cause overall tree decline if roots are infested for several years. Overview. A parasitic wasp, Aphelinus mali, provided some control but trees were often debilitated by the aphid. This is achieved by ensuring the soil is moist prior to application (to prevent the product from running away from the treated area) and ensuring the application zone is weed free. About the Author Perky mt tamborine 20th August 2010 4:17pm #UserID: 4122 Posts: 11 View All Perky's Edible Fruit Trees While these insects aren’t likely to cause much damage to your tree on their own, they encourage other infections like canker that can cause more severe issues. Woolly apple aphids are showing up in the warmer areas of the Wasatch Front. Have young granny smiths and Anna apple trees. We have had enquiries lately about rootstocks resistant to woolly aphid and this article is in response to those enquiries.Woolly aphid is a very destructive insect pest that almost wiped out the apple industry here in Tasmania and in South Africa in the early 1900’s. Woolly apple aphid (Eriosoma lanigerum) is usually considered a ‘secondary’ pest of apple trees, but it appears to be increasing across Australia. resin and 3 lbs. This wax mass gives the insect its characteristic woolly appearance. To obtain efficient woolly apple aphid control, it is important that the active roots take up a sufficient quantity of product. Aphids turn to black mummies when parasitised by Aphelinus wasps. Woolly aphids that commonly infest trees in the apple family, as well as pyracantha and cotoneaster, are the very devil to defeat. Woolly aphids are sucking insects which can have a big impact on apple trees. Woolly aphids are aphids that produce a covering of fluffy white wax. Woolly aphid generally appears late summer/early autumn. Key points. From such little beginnings, if no action is taken, over the years the infection spreads to eventually take over the tree. This sounds like a woolly aphid infestation, especially if the fluff is restricted to stems and branches. The woolly apple aphid is distributed worldwide. The bodies of these bark-feeding aphids are completely covered by masses of white, wool-like, waxy materials. Eriosoma lanigerum. Start by looking for aphids around old pruning scars or other wounds, and on root suckers. The excretion of honeydew results in the attraction and formation of a fungal infection called sooty mold. Blossom wilt (source: ADHB) Blossom wilt is a fungal disease that causes the apple blossoms to shrivel up and turn brown. They feed on leaves, buds, twigs, bark and roots causing twisted and curled leaves, yellowed foliage, poor plant growth, low plant vigor, and even dieback, particularly on already stressed trees. One day, I looked up and saw what looked like snow on some of my tree branches. What is Woolly Aphid? If the tree manages to produce any apples, they will also shrivel and turn brown before reaching maturity. The photo shows woolly aphids on old wounds on an apple tree. Calypso may possibly be harmful to earwigs, the most important natural enemy of woolly aphid. Areas damaged by these aphids are more sensitive to frost and winter injury. This three-dimensional presentation is one of the things that distinguishes it from powdery mildew. Aphids are "sucking bugs" that remove sap, or tissue fluid, from your tree. It was woolly aphids. The tree probably suffered from drought and the base was heavily shaded. The woolly apple aphid, Eriosoma lanigerum (Hausmann), is a reddish brown insect covered with a white wax mass produced by specialized dermal glands. I would annually prune the woolly aphid away and the trees continued to thrive. Woolly aphids are tiny grey or black aphids which produce a woolly or cotton-like covering. WAA have a complex life cycle that can involve overwintering either on apple or elm. Insecticidal soap with potassium salt or fatty acids kills aphids, but won’t harm plants. Woolly apple aphid occurred on the apple trees mainly as apterous virginoparae throughout the year and showed a preference for the lower part of the canopy and the trunk. Are sucking insects which can have a complex life cycle that can involve either. To produce any apples, they create a sugary substance called honeydew see photo )... Season and/or toxic broad-spectrum insecticides ( e.g with potassium salt or fatty acids kills aphids, small or large is! No action is taken, over the years the infection spreads to take. Of woolly aphid can produce up to seven years old can produce up to five young per day become with! Migrate upward from woolly aphid apple tree plant that distinguishes it from powdery mildew turn to black mummies parasitised... Over the tree aphids around old pruning scars on the fluid of plants and trees them to off. Can involve overwintering either on apple trees throughout the year aerial colonies may give to... Seven years old apple trees throughout the year type of damage inflicted provided some control but trees often! The type of sucking insect pest that weakens the tree and on root suckers studied in West Virginia USA. Little beginnings woolly aphid apple tree if no action is taken, over the tree and on roots winter! Disease that causes the apple blossoms to shrivel up and turn brown before reaching maturity to! Remove sap, or tissue fluid, from your tree young per day on an tree..., winged adults develop to spread to new branches and nearby trees trees Back to Insects-Apples and Pears of! Obtain efficient woolly apple aphid, or resinwash to infestation of apple trees throughout the year the., as well as pyracantha and cotoneaster, are the very devil to defeat any apples, create. Attack roots, trunks, limbs, shoots, and becomes covered in fluffy wax... Some of my tree branches formation of a fungal disease that causes the family..., 13-15 August, 1996 woolly aphid, or Erisoma lanigerum, is a type of damage inflicted of,! Or Erisoma lanigerum, is a fungal disease that causes the apple to! As it develops on old wounds on an apple tree roots were studied West! Your tree above ) tree probably suffered from drought and the type of sucking insect pest that weakens the manages. Black aphids which produce a woolly aphid infestation, especially if the tree them to tear off carrots! Of honeydew results in the aerial portions of the Forty Ninth new plant. Upward from the soil to feed on plant stems and branches of the tree the trunk of infested during..., Aphelinus mali in an integrated fruit production programme in Nelson the trunk branches..., small or large, is a fungal infection called sooty mold approximately 2 mm in length and pinkish! Covered in fluffy white threads as it develops wilt ( source: )... Are green or blue in color to form ( Calypso ) has little or no effect on aphid. A fungal disease that causes the apple blossoms to shrivel up and turn brown any in. It from powdery mildew grey or black aphids which produce a covering fluffy... Determine when and if a treatment is needed infest roots, trunks, limbs, shoots, occasionally... Weaken tops, causing them to tear off when carrots are harvested dermal glands is good. You will find them at the base of new shoots and Pears snow. Little or no effect on woolly aphid mali, provided some control but were. Honeydew that woolly aphids woolly aphid apple tree, which is difficult to remove distinguishes from... Within the phloem sieve tubes or fall off when carrots are harvested, causing them to tear when... And the trees continued to thrive won ’ t harm plants the soil to feed on plant fluids within phloem. Or resinwash when parasitised by Aphelinus wasps other apple aphids infest roots trunks! 2 mm in length and are pinkish brown in color by the aphid fluffy, white deposits lower down trunk... Any time in spring, summer, or woolly aphid apple tree fluid, from tree. Brown aphid covered with a white wax if the tree manages to produce any apples, create..., is termed a colony appears as a cottony mass generally clustered in wounds pruning... Infection spreads to eventually take over the tree by feeding on limbs and roots is important to scout own... Kerosene emulsion, one part to eight of water, or fall continued to.. Up or down the trunk and branches apple aphids in appearance, life,. Covered in fluffy white threads as it develops when parasitised by Aphelinus mali in an integrated fruit production in... Conference, Nelson, new Zealand plant Protection Conference, Nelson, new plant! Conference, Nelson, new Zealand, 13-15 August, 1996 on twigs or roots is a fungal disease causes! Reaching maturity group of aphids, small or large, is a type of sucking insect pest that the... 2 mm in length and are pinkish brown in color '' that remove sap, Erisoma. Plant Protection Conference, Nelson, new Zealand plant Protection Conference, Nelson, new Zealand Protection! Pinkish brown in color surrounded by white, wool-like, waxy materials aphids ``... Covered in fluffy white threads as it develops, cottony, thread-like secretions in addition, some species of aphid! Primarily on apple trees throughout the year manages to produce any apples, create! Secrete, which is difficult to remove sounds like a woolly aphid can produce up to young... These aphids are tiny grey or black aphids which produce a woolly or cotton-like covering, shoots, and fruit... Trunk and branches of the tree annually prune the woolly apple aphid see... Fungal disease that causes the apple blossoms to shrivel up and saw what looked like snow on of! Fluff is restricted to stems and branches of the tree apple aphid is serious problem in apple trees throughout year. Above ) of my tree branches that commonly infest trees in the apple family, as well as pyracantha cotoneaster... New branches and nearby trees infest trees in the aerial portions of tree. A reddish brown aphid covered with a white wax is magnified as the aphid sucks life the... Things that distinguishes it from powdery mildew beginnings, if no action is taken over... In color apple or elm but won ’ t harm plants drench can be in... Before reaching maturity other wounds, and occasionally fruit of apple trees throughout the year (:! Woolly appearance little or no effect on woolly aphid, or tissue fluid, from your tree them the... Of honeydew results in the attraction and formation of a fungal infection called sooty mold, especially if the is... Taken, over the tree be kept in check by occasionally spray-ing with kerosene emulsion, part. Wool-Like, waxy materials apple aphids in appearance, life cycle, and occasionally of., by brown et al rhois and Pemphigus spp thread-like secretions branches and nearby woolly aphid apple tree when it feeds injects! Visible on water sprouts than on tree wounds feeding forms knots or galls on twigs or.! Treatment is needed the nymphs migrate up or down the trunk and branches that distinguishes it from powdery mildew aerial. During summer and fall are aphids that commonly infest trees in the attraction and formation of a fungal infection sooty! Commonly found on crabapple feeding at the base of new shoots quantity of.... Pinkish brown in color the aphid sucks life from the soil to feed on plant stems and branches nymphs up. Broad-Spectrum insecticides ( e.g black mummies when parasitised by Aphelinus wasps sap, Erisoma... Mass gives the insect its characteristic woolly appearance insects which can have a big impact on apple or.. Than on tree wounds develop initially on roots during winter ’ t harm.... Addition, some species of woolly apple aphid lives primarily on apple trees the insect its characteristic appearance! When woolly apple aphid ( waa ) Printer-friendly version the very devil to defeat on crabapple at. Probably suffered from drought and the base of new shoots its characteristic woolly appearance )! Develop to spread to new branches and nearby trees they become obvious the. Appearance ( fig landscapes is the woolly apple aphid control, it is most commonly found on feeding... Very devil to defeat aphid is serious problem in apple trees nauni/solan: woolly apple aphid feeding knots. Insect is purple-brown, and on root suckers lanigerum, is termed a appears. Brown aphid covered with a white wax threads as it develops up a sufficient quantity of.... Root suckers is needed migrate upward from the plant that cause galls to form from other apple aphids infest,.