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birch sawfly control

Thank you. You also mentioned that I could possibly buy a liquid systemic product. Q: Last summer I called your radio show and asked how to get rid of caterpillars on several river birch trees in my back yard near my goldfish pond. A sawfly is a primitive wasp-like insect. Favours habitats where Birch trees are found. Local throughout Britain, not very common. Pest description and damage Mature birch sawfly larvae are yellowish with rows of black spots along the abdomen and 0.75 inch long. The head is reddish yellow with black eyespots. Browse and purchase gardening books by Walter Reeves, plus select titles by other authors. Your answer was to get an organic product, and spray it on at intervals until all the caterpillars were dead. The solitary larvae feed on Silver Birch leaves between June and September and can grow up to 45mm in length. Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015, Leicestershire Amphibian & Reptile Network, Market Bosworth & District Natural History Society, Natural History Section, Leicester Literary & Philosophical Society, Leicestershire & Rutland Swift Partnership. Thank you for reviewing this information. Action: The dusky birch sawfly’s primary host is River birch, but sometimes grey, black, red paper and yellow birch are also attacked. Also, when larvae are one-half full grown or larger they will do little more feeding. Bt (Bacillus thuringiensis), which is an effective natural control for true caterpillars, is ineffective on sawfly larvae. Well, I have forgotten the name of the insecticides that you mentioned. A black edged bluish stripe runs along the middle of the larva's back for the length of its body. The females have a saw-like blade at the tip of the abdomen that is used to cut slits into plant tissue into which they deposit eggs. They LOOK like caterpillars to the uneducated eye but they are not. Birch sawfly (Arge pectoralis). The natural insecticide spinosad will control sawfly larvae. The adult is easily recognised by the pale band on its shiny black abdomen. Recording the wildlife of Leicestershire and Rutland. The river birch “caterpillars” are not caterpillars at all. Conventional insecticides such as malathion are also effective. I need to get busy and try to stop the caterpillars before they get real bad. Enter a town or village to see local records, Yellow squares = NBN records (all known data) There is a single row of black dots along the side of the body. Imidacloprid (click for sources)  is a systemic insecticide which can be applied to the soil around the tree before feeding activity is noticed. They are sawfly larvae. The river birch “caterpillars” are not caterpillars at all. A black edged bluish stripe runs along the middle of the larva's back for the length of its body. Both insecticides, however, are moderately toxic to fish. The contact insecticide carbaryl (click for sources) offers good control if sprayed on the entire tree. There is a single row of black dots along the side of the body. ©2020 Walter Reeves / The Simple Gardener, Inc. All Rights Reserved. A: I am so glad you wrote back….because I was WRONG last year! Up to 25mm long, the largest British Sawfly. The best time to control sawflies is early in their larval stage. The resulting larvae, since they are not caterpillars, are not affected by the organic caterpillar insecticide, Bt, that I recommended. They LOOK like caterpillars to the uneducated eye but they are not. Adults have 3-segmented antennae and lay eggs in rows in the edges of leaves. Insecticides can control the pest or small populations can be removed by hand and destroyed. They are sawfly larvae. Live with the insect. A sawfly is a primitive wasp-like insect. Just a few sawfly larvae on a large or mature plant may do little damage and can be tolerated. Dusky birch sawfly (Croesus latitarsus). In your specific situation consider using insecticidal soap (click for sources) every seven days during the few weeks in which the sawfly larvae are present. Control Strategies 1. Click here to support NatureSpot by making a donation - small or large - your gift is very much appreciated. The females have a saw-like blade at the tip of the abdomen that is used to cut slits into plant tissue into which they deposit eggs. The antennae are yellow tipped. Leaving the larvae for the birds could be a good solution and beneficial. The solitary larvae feed on Silver Birch leaves between June and September and can grow up to 45mm in length. Wings are smoky brown colour with dark brown margins.

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