Apple IPM Treatment Level Guidelines

Pest

Time of Season or Generation

Monitoring and Treatment Levels

Codling moth

European apple
sawfly
European red mite

Apple aphid,
Spirea aphid

Rosy apple aphid

San Jose Scale

Spotted tentiform
leafminers

First generation

Second generation
(including all other later trap catches)

PETAL FALL

May-early June
Late June-mid July
Mid to late July
Late July-mid August
Late August on

May-June
Early July

May

Alwaystreat this generation. This spray
may be timed at 250-degree days (DD)(base
50^oF) after the first initial moth catch in
pheromone traps. A second spray may be
needed 14-21 days after the first spray.
Initial timing coincides with roughly 2-3
weeks after PETAL FALL.

Second generation sprays should usually be
applied at 1250 to 1300 DD after the first
initial spring capture
or
Spray when trap catches exceed 5 moths per
trap per week. Insecticides should be
applied 7-10 days after this level is reached.

Total cumulative capture of 4 to 7 per trap.

2 mites/leaf
5 mites/leaf
7.5 mites/leaf
10 mites/leaf
at least 20 mites/leaf

When 50 percent or more of the terminals
are infested with visible colonies.

1 or more colonies per tree

300-350 DD (base 50^oF) after 1st adult catch
in pheromone traps (about early to mid
June).
or
When 1st crawlers have been caught on
sticky tape.

DORMANT to
DORMANT
or
1st generation crawlers.

First generation: PINK
PETAL FALL.

DELAYED

or

PINK

and

mid-

early

If leafminers were
previous season.

a

severe

problem

the

Second generation: late June
July.

to

to

If there is an average of 0.5-1 mine/leaf

If there is an average of 2 to 3 or more mines
per leaf
Only in an emergency--usually if the first
through third generations have not been
controlled. Fruit drop may occur if there is
an average of 10 mines/leaf.

Third generation:
August.

Fourth generation:
September

late

July

late August to mid-

82

1998 New Jersey Commercial Tree Fruit Production Guide