pear slug damage

Published by on November 13, 2020

Re-inspect in late July or August for the summer generation. The pear sawfly, commonly called pear slug, is of European origin. Period of Activity Soaps also have been effective for controlling pear slugs (see fact sheet 5.547, Insect Control: Soaps and Detergents) but can injure plants such as cotoneaster, plum and cherry. Attacks pear, cherry, and plum. Webmaster | A soap spray may be sufficient, or use the new biological spray spinosad. Some features of this website require Javascript to be enabled for best usibility. The back end is slightly tapered and raised a little from the leaf surface on which it feeds. As feeding progresses, the affected areas on individual leaves enlarge and merge, until the leaves look bleached. Non-Discrimination Statement | Pear slugs are dark green to orange, swollen at the head end, and slimy. However, frequent, limited outbreaks have been reported in sweet cherry orchards in the Mid-Columbia region of Oregon and Washington. Spraying with water from a garden hose will also knock off and kill quite a few. Eggs are often laid on peach leaves in trees near infested pear and cherry orchards, but larvae do not thrive on peach. Hosts include American mountain-ash, cherries / plums, common pear, hawthorns, plum, quince, serviceberries. Should I cover the aboveground part with soil? After feeding for two to four weeks, when the pear slugs are about a half-inch long, they crawl or drop to the ground. CSU A-Z Search Check under potato plants and cover any visible tubers with soil or mulch. Management. Are you familiar with this pest? When mature, larvae drop to the soil and overwinter as pre-pupae in a cocoon. *W.S. Trees and shrubs appear scorched when their damaged leaves then turn reddish brown. Learn more about us or about our partners. E-mail: Blog: Theypear slug larvae may reach 1/2 inch. Two generations of pear slug occur. When feeding, pear slugs eat the tissue between leaf veins, but leave the veins themselves intact. Thresholds No thresholds currently established in Ontario.  This is considered a minor pest of pears. In Canada its preferred hosts are cotoneaster, hawthorn, mountain-ash, pin cherry, and various other fruit trees. The trees look unsightly due to the affected foliage, which may drop prematurely. After mating, the female pear sawfly inserts eggs into the lower surface of the leaf tissue. Pear Slug (Pear Sawfly) Phil Pellitteri, UW Insect Diagnostic Lab . At this stage, it is 8-12 mm long and has 10 pairs of legs, 5.8 mm long, 2.4 mm wide and lemon-yellow, Glossy black and yellow wasp-like insect, about 5 mm long. Adult pear sawflies are small, black wasp-like insects, about 5 mm long, which emerge from mid-June until mid-July. Hosts. Although damage from the insect can be severe, especially on pear and sweet cherry, it is not considered a major pest. Larvae are present in late spring or early summer and immediately begin to feed on the upper surface of the leaf. Pear slug larvae feed on the upper leaf surface. Scouting Notes When full-grown, pear slug larvae may reach 1/2 inch. At this stage, it is about 3/8 inch (10 mm) long and has 10 pairs of legs. The damge from this generation is usually more severe, sometimes retarding tree growth the following year. However, serious infestations can damage most of the leaves and cause them to fall. Adults emerge in late spring. In the spring, adults insert eggs into slits they have sawn in leaf undersides. Early detection can often result in simple cultural control measures. Attacks pear, cherry, and plum. As the pear slug grows in size, it becomes somewhat lighter in color, until it is nearly orange-yellow when full grown (B). The adult is small, black-bodied with the ventral side and legs yellow in colour, Slug –Larvae of pear sawfly secretes a slimy olive-green coating over its slug-shaped body, though not a true slug, Moth (Lepidoptera) caterpillars –Sawflies have five or more pairs of abdominal prolegs, while caterpillars have four or fewer. Second generation adults begin to emerge in July. Little is known about biological control of the pear sawfly. It takes 3 to 4 weeks for the larvae to pass through the five stages of development. On heavily infested trees, leaves turn brown, wither and drop. You don't have to cover up the exposed part of the root. On heavily infested trees, the leaves will turn brown, wither and drop. Before the last molt, the front of the body becomes enlarged, concealing the head, and tapering toward the anal end. This second, midsummer generation is usually larger than the first. If the second generation causes extensive defoliation of trees, bloom may be reduced the following spring. The crop that does need a cover-up if it peeks above the soil is the potato. MSU is an affirmative-action, equal-opportunity employer. A: The little creature that is turning your pear and cherry leaves to lace is commonly known as a pear slug, though you are correct that it is not a slug, but a caterpillar.

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