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|In the landscape, this pest prefers mugho and table top pines. However it readily attacks Scotch, red, Jack, and Japanese pines.
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European Pine SawflyThe European pine sawfly, Neodiprion sertifer (Geoffroy), is the most common sawfly found infesting pines in landscapes, ornamental nurseries and Christmas tree plantations. Sawfly larvae look like caterpillars but they are the larvae of primitive wasp-like insects. They are common from southwestern Ontario through New England and west to Iowa. This pest was accidentally introduced from Europe.
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Reference: Ohio State University Extension
Description and Life Cycle
Strategy 1: Natural Controls - Several parasites have been introduced to control this pest and native birds feed on the larvae. Rodents often eat the pupae in the soil. These agents are usually not adequate in urban settings.
Strategy 2: Mechanical Control, Egg Removal - If the needles containing overwintered eggs can be found before they hatch, they can be pulled off the plants and destroyed. Do not simply through on the ground since the eggs can still hatch.
Strategy 3: Mechanical Control - Colonies of larvae can be easily removed by clipping off the infested branch. Place these branches in a plastic bag and destroy. Colonies can also be knocked off by sharply striking the infested branch. Crush the larvae or knock into a pail of soapy water. If few colonies are present, they can be controlled using these methods but large infestations are better controlled by general spraying.
Strategy 4: Biorational Insecticide Sprays - Several horticultural oils (often called "summer" or "verdant" oils) and insecticidal soaps are labeled for control of sawflies on ornamentals. These usually work well when the sawfly larvae are small and thorough coverage of the colony can be achieved.
Strategy 5: Spot Sprays of Insecticides - Many aerosol or hose end sprayable insecticides are available for spraying of colonies. This is usually adequate for most home landscapes. Nurserymen and Christmas tree growers often carry a small hand pump sprayer with an insecticide mixed for spot treating colonies.
Strategy 6: General Insecticide Spraying This sawfly rarely infests large acreages unless controls have not been used for several seasons. General sprays may be warranted if more than 25% of the trees are infested.
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|Data Source: Ohio State University Extension. Articles and resource may contain pesticide recommendations that are subject to change at any time. These recommendations are provided only as a guide and it is always the pesticide applicator's responsibility, by law, to read and follow all current label directions for the specific pesticide being used.|