| Pest |
Where to look |
When to look |
What to record |
Comments |
| Scab |
Flower bud leaves |
Starting 10-14 days post
bud break |
No. leaves with spots |
May be noticed first on
underside of leaf. Cortland,
Empire, Jersey Mac,
Jonagold, McIntosh, Mutsu,
Rome, and Staymen are very
susceptible to scab.
|
| Leaves |
Beginning at emergence |
No. leaves with spots |
| Fruit |
Fruit set through maturity |
No. scabby fruit |
| Fire blight |
Blossom/spurs |
Bloom period to first cover |
No. blighted blossoms/spurs |
Especially during warm,
humid, rainy periods. Fuji,
Gala, Granny Smith,
Indared, Jonathan, Mutsu,
Paulared, Rome, & York are
extremely susceptible. |
| Twigs suckers |
During active shoot growth |
No. blighted twigs |
| Powdery mildew |
Leaves/terminal shoots |
During active shoot growth |
No. mildewed terminals |
Cortland, Granny Smith,
Idared, Jonathan, Mutsu,
and Rome are highly
susceptible |
| Rust |
Cedar branches |
Starting at apple pink bud |
Emergence of orange fungal
telia from cedar galls |
Note presence of cedar galls
before and during bloom;
this signals probable apple
infection periods. TYPE 1
common on Sir Prize, Prima,
Lodi, Jonathan, Rome,
Wealthy, & York Imperial.
TYPE 2 common on
Cortland, McIntosh, Red
Delicious, Golden Delicious,
Staymen, and Winesap. See
page 34 for description of
Type 1 and Type 2 fruit
spots. |
| Leaves |
Starting 30 days post bloom |
No. leaves with rust lesions |
| Fruit (especially blossom
end) |
Fruit set to maturity |
No. of fruit with rust colored
spots (Type 1) & dark
sunken blossom end spots
(Type 2) |
| Frogeye leaf spot |
Leaves |
Beginning at petal fall |
No. Leaves with spots |
Also note presence of dead
twigs & branches, branch
cankers, fruit mummies, leaf
yellowing and drop. |
| Collar rot |
Orchard |
All season |
No. weak or collapsing
trees. Look for brown stain
under bark at tree base. |
Most severe on clonal
rootstocks MM.104,
MM.106, & M.26. M.7 &
M.2 have some field
resistance. |
| Canker |
Twig and limbs |
All season |
Record occurance of cankers |
Especially on weakened or
poorly growing trees. |
| Black rot |
Fruit |
As fruit ripen |
No. of affected fruit |
More common on old trees.
Note presence of mummified
fruit in trees. |
| Bitter Rot |
Fruit |
When fruit are half grown
through maturity |
No. of affected fruit |
Look also for other rots
which occasionally appear
on fruits. |
| Sooty blotch Flyspeck |
Fruit |
As fruit reach maturity |
No. of affected fruit |
Note disease as light (less
than 5% of surface
blemished), moderate (5-20%) or severe (20% or
more). |
