Because of our climate, Wisconsin always has a risk of spring frosts. Temperatures below 28°F will injure or kill flowers or immature fruit. This factsheet will briefly outline critical temperatures at different stages of flower development, and describe how a gardener might protect against late season frosts.
Author(s): T.R. Roper Watercore of apple is a physiologic disorder. The fruit tissue’s abnormal condition is a response of some apple cultivars to adverse environmental conditions—not to a disease-causing organism. Watercore is more common in warm, arid regions, but it occurs in Wisconsin often enough to concern apple growers. Find out more about this apple […]
Author(s): P.S. McManus, M.F. Heimann Sooty blotch and flyspeck are separate diseases that often occur together on apple and pear fruit during late summer. This fact sheet will help you better understand, identify, and control these diseases. Download Article
Author(s): D.L. Mahr, P.S. McManus, T.R. Roper Strawberries are one of the easiest fruit crops for gardeners to grow. However, they are susceptible to many disease and insect pests that must be managed to produce consistent crops of edible fruit. This brief 2-page bulletin is a companion to Extension publication Growing Strawberries in Wisconsin (A1597), […]
Author(s): M.F. Heimann, S.N. Jeffers A serious disease of apple and pear trees in the Midwest, fire blight also affects many other members of the rose family, including raspberry. Although still relatively rare on raspberries, this disease has become increasingly common on certain red raspberry cultivars in Wisconsin. Find out hot to spot, prevent, and […]
Author(s): R.C. Williamson, C.F. Koval Skeletonizing of the leaves of roses, raspberries, grapes, fruit trees, and many other cultivated trees and shrubs may be caused by the adult rose chafer, Macrodactylus subspinosus (Fabricius). Adult beetles are attracted to flower blossoms, particularly roses and peonies. Damage occurs in June and tends to be most severe in […]
Christelle Guédot, UW-Madison Entomology Revised: 01/09/2015 Item number: XHT1237 Spotted wing Drosophila (SWD), Drosophila suzukii, is an invasive vinegar fly native to Southeast Asia. It became established in Hawaii during the 1980’s, and was first discovered in the continental United States in California in 2008. SWD quickly spread throughout the Pacific Northwest and Canada, and […]
Root-knot nematodes (Meloidogyne spp.) are small, soilborne, worm-like organisms that infect many agricultural and horticultural plants. This publication describes the symptoms, management and control of root-knot nematodes in Wisconsin.
Isael Rubio*, UW-Madison Plant Pathology Revised: 4/1/2014 Item number: XHT1227 What is angular leaf spot? Angular leaf spot is a severe bacterial disease that can adversely affect strawberries wherever they are grown, potentially causing yield losses of up to 75%. The disease appears to have originated in the U.S and was first described in Minnesota […]
Christelle Guédot, UW-Madison Entomology and Bryan Jensen, UW IPM Program Revised: 3/26/2014 Item number: XHT1236 Brown marmorated stink bug (BMSB), Halymorpha halys, is an exotic, invasive insect native to Asia, including China, Japan, Korea and Taiwan. BMSB was first confirmed in the United States in 2001 although an unconfirmed sighting was reported in Pennsylvania in […]
Chen Zhang*, UW-Madison Plant Pathology Revised: 3/5/2014 Item number: XHT1232 What is raspberry anthracnose? Anthracnose is a common disease that causes significant reductions of yield and fruit quality on raspberries in the United States. Black and purple raspberries (oftentimes misidentified as blackberries) are particularly susceptible to anthracnose, while red raspberries are less susceptible to the […]
Ashley Ellinghuysen, UW-Madison Plant Pathology Revised: 6/22/2013 Item number: XHT1220 What is brown rot? Brown rot is a destructive fungal disease of trees and shrubs in the genus Prunus which includes peaches, plum, cherries, apricots and nectarines. Brown rot is particularly a problem on the fruits of susceptible plants, with the potential to cause losses […]