If you have not done this and your fruits have had bitter pit in the past, consider 1 to 2 calcium sprays (applied several weeks apart) on expanding fruit before harvest. In any case, they pupate in summer. 1). USU Biology graduate students, Zach Schumm and Cody Holthouse have been searching for the Samurai wasp by clipping cards containing BMSB egg masses (laid in a rearing chamber) to leaves in various locations in northern Utah, and then monitoring these eggs for parasitism. Be sure to read the instructions at the top of the page, for how to read the table. Hi Lisa, Your logic about slugs was actually in the right direction. It will be important to monitor your own trees and orchards for stink bug activity. This scale-free area, plus their narrow wings, long legs, and banded abdomen combine to give them a wasp-like appearance (as Wikipedia says, it’s “… hymenopteriform Batesian mimicry.”). The greatest amounts continue to occur in the Salt Lake City area, but so far this season, no crop damage (due to BMSB) has been reported. The larvae live and bore into the crown and roots of blackberries, raspberries, loganberries, and wild brambles for two years. The blackberry (raspberry) crown borer is a serious pest of blackberry plantings and causes loss of plant vigor, loss of yield and plant destruction. Raspberry moth (Lampronia corticella) The adults are butterflies. This is called a Crowned Slug, but it is really a caterpillar, Isa textula. The swellings may be confused with those caused by rednecked cane borer. Calcium chloride or calcium nitrate at not more than 5 lb/100 gal are options. The Strawberry Crown Moth is found throughout the western United States and British Columbia wherever strawberries are grown. Later-season feeding causes the fruit to be unmarketable, where feeding sites on the fruit turn brown and corky, and fungi or bacteria may be introduced. If you can easily pull it out of the ground, it could be crown borer. One larva may ding three or four canes in a year. The adult is active during the day. But, it was deliberately introduced into Hawaii, that great ecological petri dish, to control the previously-deliberately-introduced-and-now-invasive blackberries. To determine crown borer, yank on the symptomatic cane. There is no threshold established, so if stink bugs are found on the cloth, take time to inspect the fruit for damage before making a decision on applying a pesticide. Stink bugs overwinter as adults and a large population that survived the winter most likely emerged later in the season than normal, and simultaneously in mass numbers. The big news is that the Samurai wasp (Trissolcus japonicus) was detected in Utah. They become active in April and May and feed for a short time before pupating in the crown in May and June. The lesions are located mainly on the bottom (calyx) end of the fruit and are circular in shape. In both groups, the major damage is caused by the larvae or borers of these pests that tunnel into plant tissues. Keep in mind that you do not need to worry about keeping fruit protected from codling moth after September 15. The most effective products on adult true bugs are the broad-spectrum insecticides (carbaryl and pyrethroids, including the organic pyrethrin). Bitter pit may occur when not enough calcium reaches apple fruits, causing sunken, brown lesions on the skin and flesh. Note that there’s not much you can do about successful entries that you find, unless you want to carefully search for the larva under the bark. Early-season feeding results in “cat-facing”, where the fruit does not develop fully because of the feeding damage. The female moths are slightly larger than the males. Do not spray at temps above 80-85F, and add a surfactant to all sprays to reduce the possibility of burning. This fall or next spring, inspect a random selection of trees. Raspberry Crown Borer If the leaves on your raspberry bushes are turning red prematurely, or entire canes are wilting, you're dealing with raspberry crown borers.
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