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Showing results for content tagged 'plums'. Search instead for the keyword 'plums'.

  • Plums

    MSU Extension focuses on the growth of the plum industry and offers information and resources provided by educators, to inform researchers of possible diseases and updates.


  • Plum rust mite

    Plum rust mites (PRM) generally restrict their feeding to new foliage, causing these leaves to brown and roll upward longitudinally

  • Pear slug (Pear sawfly)

    The adult looks similar to a small, black-bodied wasp with the ventral side and legs yellow in color. The larva is small, fleshy, dark green to orange, slug-like, and slime-covered, with the front part of the body enlarged.

  • Flatheaded appletree borer

    The adult is a short-horned beetle, flattened above, with short antennae and large conspicuous eyes. The upper surface of the body is dark metallic brown with slightly patterned wing covers.

  • Bacterial canker (blossom blast)

    Leaf scars, stomata, and areas of injury are the principal sites of infection. The most conspicuous symptoms are limb and trunk cankers, blossom blast, "dead bud", and leaf spotting; these symptoms may or may not occur together.

  • Silver leaf

    Silvering of the foliage is the characteristic symptom. At first, silvering may be associated with only one or two major branches, but eventually the entire tree becomes silvery in appearance. When infection is severe the leaves may curl upward.

  • Minute pirate bug

    Adults are very similar in size to the mullein plant bug (Campylomma varbasci), but their head is narrower and their wings are colored contrasting white and black.

  • European earwig

    The European earwig is dark brown with an elongated body, equipped with pincer-like forceps at the rear of the abdomen. The short elytra do not entirely cover the abdomen.

  • Black knot

    Black knot usually develops over two seasons. The disease first appears in late summer or autumn as an olive-green swelling on new shoots. Disease develops rapidly the following summer, forming a characteristic dark, course-textured warty knot.

  • Snowy tree cricket

    Adult somewhat resembles a field cricket, but is pale green in color and has a longer, more slender body and smaller head. Antennae are much longer than the body; males have stiff veins in their flat wings.

  • Perennial canker of stone fruit

    Small twig infections are usually found around winter-killed buds, leaf scars, and picking and pruning injuries. They appear as sunken discolored areas with alternating zonation lines and may ooze amber gum unless the twig is killed.

  • Spotted tentiform leafminer

    The adult is a tiny beige moth with heavily fringed wings striped with golden brown and white bands. Eggs are laid individually on the undersurface of the leaves.

  • Constriction disease of Stanley plum (Brown line)

    Brown line disease is due to an incompatibility at the graft union when Stanley plum and some other European or hybrid plum varieties are grafted onto Myrobalan rootstock. Asian plums are not affected. Infected trees show a general decline and bear small, pale green leaves.

  • Oystershell scale

    The adult female remains immobile under a small brown scale in the shape of an oyster shell attached to the bark of branches. The white and oval eggs are laid inside the scale and crawlers emerge in the spring during the petal fall stage of apple.

  • Prionus borers

    Adults are robust, broad, somewhat flattened blackish to reddish brown beetles with antennae roughly half the length of their bodies.

  • Click beetles

    The click beetle is dark-colored its body is hard and elongated it has a characteristic pair of spurs and sometimes colorful markings on its thorax.

  • Prunus necrotic ringspot

    Individual branches or the entire tree shows delayed budbreak or foliation, stunted wavy leaves, and shortened blossom pedicels in spring. Leaves develop chlorotic spots, lines, or rings as they emerge.

  • Peach tree short life (PTSL)

    Trees in their third to sixth year show a sudden wilt and collapse of new blossoms and death of branches, with tree death following within weeks of initial symptoms. The bark of affected trees appears reddish and water-soaked and gum exuding from these tissues often has a "sour sap" odor.

  • Green fruit rot

    Both fungi attack the blossoms but rarely invade the twig.

  • Green stink bug

    Stink bug adults have a broad, flattened, shield-shaped body and a narrow head. The green stink bug is uniformly grass-green.

  • Crown gall

    Infected trees are often stunted and produce small, chlorotic leaves. Spherical to elongated swellings along the roots or on the trunk just above the soil line is the primary symptom.