Fruit Tree Pathology Lab at Virginia Tech
In terms of delayed dormant copper, so far we have always operated under the assumption that the delayed dormant copper application is effective as one mancozeb application for apple scab. Before thinking about starting a scab spray program, one must determine if they have cultivars …
A standard recommendation for delayed dormant copper is applying it on apples between Silver Tip and until but not beyond quarter inch green tip (QIG). QIG is determined by looking at the floral apple buds which are wider in appearance and situated on spurs. Leaf …
Join RIMpro Partnership in Virginia, North Carolina and New York: Learn How to Use RIMpro Apple Scab and Fire Blight Prediction Models Join a group of growers in Virginia, North Carolina and New York (yes, we are growing!) who have used RIMpro prediction models for …
(I) Reducing Overwintering Inoculum of Apple Scab Fungus (Venturia inaequalis) and Marssonina Leaf and Fruit Blotch (Diplocarpon coronariae) If symptoms of apple scab were visible on leaves or fruit during the 2025 growing season, you should plan to reduce overwintering scab inoculum residing in leaf …
We have detected first symptoms of bitter rot disease on fruit of apple cultivar ‘Idared’ in Winchester on 7/1/2025 at the AREC’s experimental Block 30 (Figures 1-4). The rot started on the sun exposed fruit side (Figs 1 – 4). Apple bitter rot is caused …
TO ALL LOCATIONS WITH THE POME FRUIT IN VIRGINIA: There is a warning issued this evening for isolated severe thunderstorms predicted for Virginia locations listed below that have a chance to large size hail and wind gusts that can trigger trauma blight. Trauma blight are …
(I). FIRE BLIGHT. As of last week (12 May), first fire blight symptoms were visible in Southern and central Virginia (Figs 1 and 2). We are aware that symptoms of fire blight were probably visible much earlier in different warmer locations (from 5 May on), …
Based on the long range forecast for 2025, we will be expecting more rain in months prior to apple harvest. Apple bitter rot disease is a significant risk for apple production in apple orchards of the whole East U.S. Coast and Midwest. Apple bitter rot …
(I) We are very close to the end of primary apple scab season but we are not there yet. We call the ned of the primary scab season when the apple scab fungus’ Venturia inaequalis ascospore number in the spore bank in the leaf litter …
Due to extremely conducive conditions, all the major apple fungal diseases in the Northern Virginia are visible as of 2 May 2025: apple scab (Figs 1, 2), powdery mildew (Fig. 3), and rust (Fig. 4). On 2 May, I found first fresh apple scab infections …