Preliminary Report on 2021 Apple Powdery Mildew Efficacy Trial at Virginia Tech's AREC

The preliminary efficacy trial results conducted at AREC in 2021 can be downloaded via this link:

Preliminary Report on Efficacy of Gatten and Parade Fungicides in Control of Apple Powdery Mildew at AREC in Winchester VA

Figure 1. RIMpro apple powdery mildew output for April in Winchester, VA.

Figure 1. RIMpro apple powdery mildew output for April 2021 in Winchester, VA.

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First Symptoms of Apple Blotch Disease Visible on Leaves in Winchester VA

On 26 July we visited a classic training system orchard in south part of Winchester, VA, with trees of apple cv. 'Ginger Gold' and detected symptoms of Apple Blotch Disease (ABD), also known as Marssonina Leaf Blotch (MLB). The symptoms were found on the lower scaffolds in the canopy and are visible in Figure 1 . This disease primarily expresses on apple leaves and is caused by a pathogenic fungus Diplocarpon coronariae . Even though we recently experienced dry weather periods in the Shenandoah Valley, e xcessive rains we received in May and June 2021 favored the development of ABD. Leaf symptoms express as grey to brown large round spots (blotches) that can merge. This leads to leaf yellowing. Figure 1. Apple Blotch Disease (aka Marssonina Leaf Blotch) on apple cultivar 'Ginger Gold' in Winchester, VA. If effective fungicides are not applied timely, continued infections by D. coronariae can occur during s...

First Symptoms of Sooty Blotch & Flyspeck and Apple Blotch Disease Visible in Virginia: 22 July 2021

On 22 July we detected the first signs of sooty blotch and flyspeck (SB&FS) on an unknown apple cultivar fruit in Appomattox VA ( Fig. 1 ). This is visible, of course, on fruit that were not treated with any fungicides during spring or summer and likely the advanced development stage indicates that fruit exhibited these symptoms for 5 to 10 days before we detected them. Depending on your spray schedule and used fungicides, we hope you do not see this disease on your fruit. However, s tart scouting your orchard to check for absence or presence of SB&FS symptoms now to see how well was your fungicide coverage during the cover sprays. FIGURE 1. FIRST SIGNS OF FLYSPECK AND SOOTY BLOTCH ON FRUIT OF UNKNOWN APPLE CULTIVAR IN APPOMATTOX VA (PHOTO BY ACIMOVIC 2021). CLICK ON THE PHOTO TO ZOOM IN. In 2021, the weather conditions during spring and through the beginning of summer 2021 were highly favorable for Apple Blotch Disease (ABD), also known as Marssonina Le...

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