Plum, Prune (Fresh): Armillaria root rot Categories: Plum, Prune (fresh) Plum, Prune (Fresh) Diseases Tree Fruits Last review date: 2025-08-23 07:22 White fungal mat of Armillaria root rot infecting trunk Photo by: C.R. Foss Biology Armillaria root rot is a fungal disease often found in newly cleared soils or soils which have been flooded. Aboveground […]
Plum, Prune (Fresh): Bacterial canker Categories: Plum, Prune (fresh) Plum, Prune (Fresh) Diseases Tree Fruits Last review date: 2025-08-23 07:29 Sunken area on trunk from bacterial canker infection Photo by: R.S. Byther Biology Bacterial canker can infect twigs, branches, fruit, or the trunk. Elongated, dark, purplish cankers develop during early spring, often producing bacterial ooze […]
Plum, Prune (Fresh): Black knot Categories: Plum, Prune (fresh) Plum, Prune (Fresh) Diseases Tree Fruits Last review date: 2025-08-23 07:30 Mature black knot on twig Photo by: R. Byther Biology Black knot is a fungal disease that infects cherry and plum. Early infections of twigs are elongated olive-green, corky knots. They turn black and hard […]
Plum, Prune (Fresh): Brown rot Categories: Plum, Prune (fresh) Plum, Prune (Fresh) Diseases Tree Fruits Last review date: 2025-08-23 07:33 Brown rot mummified plum Photo by: R.S. Byther Biology Brown rot is a blossom-infecting fungal disease. Infected flowers first appear water-soaked, then wilt and die. The light brown blossoms remain attached to the twigs, becoming […]
Plum, Prune (Fresh): Crown gall Categories: Plum, Prune (fresh) Plum, Prune (Fresh) Diseases Tree Fruits Last review date: 2025-08-23 07:34 Large gall on crown Photo by: R.S. Byther Biology Crown gall is caused by a soilborne bacterium. The bacteria infect through wounds on the crown and roots. Young galls are fleshy, white, enlarged masses on […]
Plum, Prune (Fresh): Cytospora canker Categories: Plum, Prune (fresh) Plum, Prune (Fresh) Diseases Tree Fruits Last review date: 2025-08-23 07:36 Cytospora-infected peach twigs Photo by: R.S. Byther Biology The fungi which cause Cytospora canker attack through wounds on twigs and branches. Initial cankers are small but enlarge quickly and may streak up and down the […]
Plum, Prune (Fresh): Plum pockets Categories: Plum, Prune (fresh) Plum, Prune (Fresh) Diseases Tree Fruits Last review date: 2025-08-23 07:38 Plum pocket infected fruit Photo by: R.S. Byther Biology Plum pockets is a fungal disease affecting fruit, twigs, and leaves. Infected fruit initially develop small, white spots which rapidly enlarge. The spots later turn reddish […]
Plum, Prune (Fresh): Russeting Categories: Plum, Prune (fresh) Plum, Prune (Fresh) Diseases Tree Fruits Last review date: 2025-08-23 07:39 Fruit russeting on plum Photo by: R.S. Byther Biology Russeting of plum can be caused by several factors. Rain during the period of full bloom, mechanical rubbing against other fruit or branches caused by wind, or […]
Plum, Prune (Fresh): Shothole (Coryneum blight) Categories: Plum, Prune (fresh) Plum, Prune (Fresh) Diseases Tree Fruits Last review date: 2025-08-23 07:41 Coryneum blight symptoms on leaves and fruit Photo by: R.S. Byther Biology Coryneum blight is a fungal disease. Lesions on leaves are initially small, purplish, round to oval areas which expand into brown spots […]
Plum, Prune (Fresh): Silver leaf Categories: Plum, Prune (fresh) Plum, Prune (Fresh) Diseases Tree Fruits Last review date: 2025-08-23 07:43 Silver leaf symptoms on leaves Photo by: R.S. Byther Biology Silver leaf is a fungal disease affecting cherry, apricot, plum, and other stone fruits. The fungus typically grows on dead wood, but it can infect […]
Plum, Prune (Fresh): Virus diseases Categories: Plum, Prune (fresh) Plum, Prune (Fresh) Diseases Tree Fruits Last review date: 2025-08-23 07:56 Virus infection causing poor growth on branches Photo by: R.S. Byther Biology Virus diseases in prunes and plums cause many variable symptoms depending on the virus strain and the cultivar affected. For instance, tomato ringspot […]
Plum, Prune (Fresh): Aphids Categories: Plum, Prune (fresh) Plum, Prune (Fresh) Insects Tree Fruits Last review date: 2025-12-03 10:06 Leaf curl plum aphid Photo by: A.L. Antonelli Biology Several aphid species can be found on plums, including the hop aphid and the leaf curl plum aphid. The hop aphid is yellowish to dark green. The […]
Plum, Prune (Fresh): Apple-and-thorn skeletonizer Categories: Plum, Prune (fresh) Plum, Prune (Fresh) Insects Tree Fruits Last review date: 2025-08-23 08:00 Apple-and-thorn skeletonizer caterpillar feeding on leaf Photo by: A.L. Antonelli Biology The adult of the apple-and-thorn skeletonizer is a small dark-brown or reddish-brown moth. It overwinters as a pupa or an adult, with the female […]
Plum, Prune (Fresh): Brown marmorated stink bug Categories: Plum, Prune (fresh) Plum, Prune (Fresh) Insects Tree Fruits Last review date: 2025-08-19 09:13 Brown marmorated stink bug adult Photo by: M. Bush Biology The brown marmorated stink bug (BMSB) is an introduced pest species from Asia that is spreading quickly across the United States. Nymphs and […]
Plum, Prune (Fresh): Earwigs Categories: Plum, Prune (fresh) Plum, Prune (Fresh) Insects Tree Fruits Last review date: 2025-08-21 10:30 Adult European earwig Photo by: M. Bush Biology Earwigs are reddish-brown insects about 3⁄4 inch or less in length. Both males and females have pincers at the rear end. Earwigs are largely beneficial, feeding on many […]
Plum, Prune (Fresh): Fruittree leafroller Categories: Plum, Prune (fresh) Plum, Prune (Fresh) Insects Tree Fruits Last review date: 2025-08-23 08:02 Greenish leafroller larva with brown head Photo by: K. Grey Biology The larvae of the fruittree leafroller feed on leaves, flower parts, and sometimes young fruit. They are pale to dark green with a shiny […]
Plum, Prune (Fresh): Leafhoppers Categories: Plum, Prune (fresh) Plum, Prune (Fresh) Insects Tree Fruits Last review date: 2025-07-08 12:29 Leafhoppers and damage on apple leaf Photo by: E.H. Beers Biology Leafhoppers are typically found on the underside of leaves. Immature leafhoppers (nymphs) are usually less than 1⁄10″ long and white to greenish or yellowish in […]
Plum, Prune (Fresh): Pacific flatheaded borer Categories: Plum, Prune (fresh) Plum, Prune (Fresh) Insects Tree Fruits Last review date: 2025-08-23 08:04 Pacific flatheaded borer adult Photo by: K. Grey Biology The Pacific flatheaded borer typically attacks weakened, injured, or stressed trees. The larvae feed between the bark and the sapwood. They can weaken and girdle […]
Plum, Prune (Fresh): Peach twig borer Categories: Plum, Prune (fresh) Plum, Prune (Fresh) Insects Tree Fruits Last review date: 2025-08-23 08:06 Peach twig borer caterpillar Photo by: K. Grey Biology The peach twig borer attacks both shoots and fruit. In the spring, overwintering larvae bore down the center of shoots, causing the tip to wilt […]
Plum, Prune (Fresh): Peachtree borer Categories: Plum, Prune (fresh) Plum, Prune (Fresh) Insects Tree Fruits Last review date: 2025-08-23 02:39 Peachtree borer and damage at base of tree Photo by: K. Grey Biology The peachtree borer adult is a dark, bluish, clear-winged moth which somewhat resembles a wasp or hornet. The female, which has dark […]