Fruit Pest and Beneficial Search
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Use this search to identify diseases, insect and mite pests and beneficials, a critical step in any integrated pest management (IPM) plan. This search covers tree fruit and grape pests and is based on the publications “Tree Fruit Field Guide to Insect, Mite, and Disease Pests and Natural Enemies of Eastern North America” and “A Pocket Guide for Grape IPM Scouting in the North Central and Eastern United States.”
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Turfgrass Ant
Insect
Ants will undergo numerous generations per year. The species found on golf courses typically have chambers that can reach a depth of 4 or 5 feet below ground. Each of these may have many exits to the surface. The queen lays the eggs and 99% of the offspring are female workers who tend the queen, tunnel, feed the larvae, and forage for food for the colony
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Two-spotted spider mite
Insect
This mite can cause severe damage to wine grapes if populations reach high densities. Thin-leaved varieties are most susceptible.
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Twospotted spider mite
Insect
Adult and nymphal mites are yellowish to pale green with a dorsal pair of apparent dark "spots". Males are smaller than females and have a pointed abdomen. The female takes on an orange tinge in the fall.
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Variegated leafroller
Insect
Adult is grayish magenta with dark brown bands on the middle and end of the forewing. Larvae are pale green with yellowish green heads.
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Vertebrates - Racoon, Skunk
Insect
They move onto the area after dark and dig through the turf. They can cause damage anytime the turf is not covered with snow.
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Verticillium wilt
Disease
Leaves wilted or browned on one or several branches, often remaining attached; the rest of the tree appears healthy. Young trees are often killed by infection.
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Waitea Patch
Disease
Waitea patch is an emerging problem on annual bluegrass in Michigan. Symptoms typically begin as thin yellow rings, ranging from a few inches to a 1 ft (10 cm to 0.3 m).
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Western flower thrips and flower thrips
Insect
Western flower thrips and Flower thrips are indistinguishable without a microscope. Adults are slender and yellowish, with short antennae; the wings are long and narrow, and held over the abdomen.
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White apple leafhopper
Insect
Adults are creamy white with short antennae, translucent wings, and a long wedge-shaped body. Usually found on the underside of leaves, they jump and fly with great agility. Nymphs are yellowish, wingless and very mobile; they generally move in a back-and-forth motion.
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White Clover
Weeds
White clover is one of the most common weeds of turfgrass. It is frequently included on lists of difficult-to-control weeds. White clover, as with all legumes, has the ability to survive under low soil nitrogen conditions. It can be identified by the three leaflets attached to one petiole.
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White peach scale
Insect
Adult female is creamy-white to reddish orange, and covered by a round waxy scale that is grayish to brownish white. Adult males are tiny yellow 2-winged insects, and nymphs are oval and white to orange.
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White rot
Disease
Fruit lesions become visible 4–6 weeks before harvest, and appear as small, circular, slightly sunken tan to brown spots, sometimes surrounded by a red halo on yellow-skinned fruit.
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Widestriped green fruitworm
Insect
The adult has bluish or steel gray wings marked with inconspicuous mottled patches.
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Wild Carrot
Weeds
One of the two most common weeds of Midwestern roadsides. Wild carrot (Queen Anne's-lace) is a biennial that forms a carrot-like taproot that allows it to survive the harsh, gravely, nutrient deficient conditions that it thrives in.
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Wild Strawberry
Weeds
Wild strawberry is a trifoliate (three leaflets) weed that spreads by aggressive stolons. The leaves and fruit of wild strawberry are smaller than that of its cultivated cousin. Wild strawberry is usually found in low maintenance areas and prefers well-drained soils.
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Wild Violet
Weeds
Wild violet is a low-growing clumping (simple) perennial with a dense, fibrous root system and heart-shaped leaves that often cup toward the petiole to form a funnel shape. Wild violet is often considered difficult-to-control due to its aggressive growth, waxy leaves and resistance to most common herbicides.
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Winter moth
Insect
Adult male has grayish-brown wings; the female has remnants of wings and so cannot fly. This, in combination with the female's large body, makes the legs appear to be long, and gives her the superficial appearance of a spider.
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Woolly apple aphid
Insect
The colonies of reddish brown adults and nymphs produce waxy secretions, which resemble small tufts of wool or cotton batting. The aphids are without cornicles, possessing only abdominal pores.
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X-Disease
Disease
This disease is caused by a mycoplasma and infects many varieties of stone fruits. On cherry, infected trees tend to develop a dieback and a generally unthrifty appearance. Infected trees decline, but the rate of decline is dependent on the rootstock.
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Yarrow, Common
Weeds
Common yarrow is considered a desirable herbaceous perennial by many gardeners and is sold in its cultivated form at most greenhouses.
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Yellow Foxtail
Weeds
Yellow foxtail is a clumping annual grass that commonly invades Michigan turfs. Young plants can be difficult to distinguish from other grasses like crabgrass. Yellow foxtail produces a characteristic 'foxtail'-like seedhead.
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Yellow Hawkweed
Weeds
Yellow hawkweed is a creeping perennial of low maintenance turf, roadsides and native areas. It can be an indicator of low soil fertility or slightly acidic soils. Hawkweed spreads by stolons and rhizomes creating colonies that form patches.
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Yellow Nutsedge
Weeds
Yellow nutsedge is a persistent perennial weed of poorly drained soils. Yellow nutsedge is grass-like in its appearance with parallel leaf veination. The stem of nutsedge is triangular with leaves coming off each corner (three-ranked).
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Yellow Patch
Disease
Yellow patch, also known as cool season brown-patch, is a Rhizoctonia pathogen similar to that of brown patch.
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Yellow Rocket
Weeds
Yellow rocket is a rosette-forming winter annual that is usually associated with bare, disturbed soil or new establishments (prefers nutrient-rich, medium-textured soils).
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Yellow Woodsorrel
Weeds
Yellow woodsorrel is a common summer annual in cool-season turf. Yellow woodsorrel is one of the latest germinating summer annual weeds. Often, infestations of oxalis can be associated with spring-timed broadleaf weed control applications.
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Yellowjackets
Insect
Yellowjackets and other wasps may break open grape berry skins during late summer. Early in the growing season, wasps are mainly predatory, but late in the season they begin to search for sugar, including ripened fruit.