WEST VIRGINIA APPLE CROP PROFILE
Table 2. Seasonal activity of apple diseases in West Virginia
| Growth stage |
Scab |
Powdery mildew |
Cedar-apple rust |
Fire blight |
Black rot |
Sooty blotch and flyspeck |
Bitter and white rots |
Green tip |
+ |
|
|
|
|
|
|
Tight cluster |
+ |
+ S |
+ |
|
|
||
Pink |
+ |
+ S |
+ |
|
+ |
|
|
Bloom |
+ S $ |
+ S $ |
+ |
+ |
+ S |
|
|
Petal fall |
S $ |
+ S $ |
+ S |
+ S |
+ S |
|
|
First cover |
S $ |
S $ |
+ S |
+ S $ |
+ S |
|
|
Second cover |
S $ |
S $ |
+ S |
S $ |
+ S |
+ |
+ |
Third cover |
S $ |
S $ |
S |
S $ |
S |
+ |
+ |
Fourth cover |
S $ |
S $ |
S |
S $ |
S $ |
+ |
+ S |
Fifth cover |
S $ |
S $ |
S |
S |
S $ |
+ S |
+ S $ |
Sixth cover |
S $ |
S $ |
S |
S |
S $ |
+ S |
+ S $ |
Seventh cover |
S $ |
S $ |
S |
S |
S $ |
S $ |
+ S $ |
Eighth cover |
S $ |
S $ |
S |
S |
S $ |
S $ |
S $ |
Note: + = initial infections possible; S = observable symptoms; $ = secondary infection. Data for development of diseases may vary more than a month from year to year and by location in West Virginia