Skip to content. Spot treat young larval infestations with a registered virus or insecticide labeled for sawfly control. This particular aphid tend to restrict itself only some of the leaves and although the effect looks dramatic it rarely affects the health of the plants. The scarlet oak sawfly, Caliroa quercuscoccineae, feeds on red and white oaks but is most common in Iowa on northern red oak and pin oak. The control of sawflies is directed at the feeding larvae. The adult females usually lay their eggs into the undersides of lower leaves. Physical control for weeds involves simply hoeing or hand digging the weeds. Neem Oils will stop eggs from hatching and larvae from developing if you spray neem directly on them. They eat the leaf material between the veins but leave the network of veins ("skeletonization"). The larvae are up to 20mm long, pale green with black spots and black heads and are usually noticed after fruit-set towards the end of May. Sawfly Control The best time to control sawflies is early in their larval stage. Home gardeners: Use floating row covers to protect plants during adult emergence. This nematode is available from some garden centres or via mail order. Black grouse (Tetrao tetrix) chicks show a strong preference for sawfly larvae. It's called the Currant Blister Aphid (Cryptomyzus ribis), see the picture below. A related species attacks blackcurrants. The adult sawflies can measure up to 2cm (¾in) long, but most are around 6-10mm (¼-½in). Sawfly and moth larvae form one third of the diet of nestling corn buntings (Emberiza calandra), with sawfly larvae being eaten more frequently on cool days. Asked October 28, 2020, 6:51 PM EDT. Apply food-grade Diatomaceous Earth for long-lasting protection. No products are registered for control of this pest in home gardens. The larvae chewing on currant leaves in the photo are sawfly, not caterpillars. Each sawfly species may have a number of different plant species it will attack, and several different species may attack the same plant. %PDF-1.5 The adults are small (8 mm) black sawflies, not moths, with yellowish marks on the abdomen. Matanuska-Susitna Borough Alaska. If so which varieties? For example, bacillus thuringiensis (BT) will work against caterpillars but not sawflies. Sometimes in spring when we venture out on a nicer day we are met with the surprise of our currant leaves being reduced to veins, a mere skeleton of themselves. The control and elimination of sawflies are possible through natural solutions that do not pose harm beyond its target. Gooseberry sawfly: photo, control and prevention measures February 11, 2020. I immediately thought sawfly. Our black currants have sawflies. They also attack red and white currant bushes. One bears a few white currants but mostly just tries to survive. An adult with a length of up to 8 mm has a different color. 1 Response . Parasitic wasps and predaceous beetles commonly kill sawfly populations. DAMAGE The adult sawfly lays its eggs in the centres of gooseberry bushes, often on the underside of leaves. Black Currant Sawfly. Non-chemical control. Sawfly and Horntail Control Prune damaged foliage and stems. This is the most common pest of gooseberries, white and red currants. Adult flies frequently rest on fence rows, brush, and trees adjacent to currant and gooseberry plantings. Control imported currantworm (sawfly larvae) with a rotenone/pyrethrin mix; control currant borer by cutting off the stem just below the borer entry hole. Scouting and thresholds Scout fields in early spring for fly activity. Although it looks like a caterpillar, it is not and therefore cannot be controlled by using B.t. Wash slugs off leaves with a strong jet of water from the Bug Blaster; larvae may also be sprayed with Safer® Soap. 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