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At least 30 different insects, mites
and diseases commonly attack apple trees in Connecticut. Unfortunately,
they are not all present at the same time but appear in a definite sequence
from the time buds break dormancy until the fruit is ready to be harvested.
Therefore, it is not possible to apply two or three sprays and expect
to harvest insect and disease-free fruit.
If the insect, mite and disease recommendations given in this article are
followed carefully, you should obtain a high percentage of clean fruit
from a home planting. The proper timing of spray applications and thorough
coverage of leaves and fruit are as important as the spray materials used.
Be sure to cover all surfaces of the tree. Apply until the spray starts
to drip from the foliage.
General purpose mixtures containing methoxychlor, malathion and captan
(some contain carbaryl), have been found to be safe and effective for the
control of fruit pests. This mixture is available under a variety of trade
names at most garden supply shops. In addition, individual ingredients
of various products are available in small packages and can be mixed at
home prior to spraying. Listed below are the pests controlled for each
of these materials. Follow instructions exactly when mixing any pesticides.
| PESTICIDE |
PESTS
CONTROLLED |
| Bacillus thurngeinsis
(B.t., DipelR, ThurcideR) |
Caterpillars |
| Captan |
Scab, rots and spots |
| Carbaryl (SevinR) |
Apple maggot and chewing insects |
| Dicofol (KelthaneR) |
Mites |
| Dinocap (KarathaneR) |
Mildew and mites |
| Ferbam (CarbamateR) |
Rust, scab, black rot |
| Insecticidal soap (Insect
KillerR, M-PedeR) |
Mites, aphids and scale |
| Malathion |
Sucking insects and mites |
| Maneb, Mancozeb |
Rust, scab, and bitter rot/black
rot |
| Methoxychlor |
Chewing insects |
| Phosmet (ImidanR) |
Apple maggot and chewing
insects (curculio) |
| Superior Oil (60 to 70 sec.) |
Scale and mite eggs |
| Sulfur |
Mildew, scab and mites |
| Thiram |
Rust, scab, black rot |
| Triforine (FunginexR) |
Rust, scab and mildew |
| Note: Do not use carbaryl until at least 30 days after bloom to avoid
thinning effect. Do not use any insecticide when the flowers
are open. Protect the pollinators. Read and observe the harvest
interval on all pesticides. |
| Growth
Stage |
PESTS
|
Remarks |
| Green Tip : when green
tissue first shows from buds. |
Red mite eggs and scale
insects. |
Superior Oil (60-70 sec.
vis.) (Read the precautions on label.) |
| Half-Inch Green: when half-an-inch
of green tissue projects from the buds. |
Scab and rosy aphids. |
See Apple
Scab for more information. |
| Tight Cluster: about seven
days after Half-inch Green when blossom buds appear in a tight
cluster. Center bud may show some pink color. |
Scab, rusts, black rot, powdery mildew, rosy aphid, leafroller and caterpillars |
See Apple
Rust Disease for more information. |
| Pink: when blossom buds
separate from the cluster and all show a pink color but before
blossoms open. |
Same as above plus red
mites. |
Add a miticide where needed,
especially if oil was not used in Green Tip. See Spider Mites for more information. |
| Bloom: when 10% or more
of the blossom buds are in bloom |
Scab, rusts, black rot
and powdery mildew |
Do not use any insecticides
during the bloom period. Protect the pollinators. |
| Petal Fall: when 90% or
more of the blossoms have fallen. Sprays applied sooner may
kill pollinating insects. |
Same as above plus curculio,
codling moth leafrollers and codling moth. |
Try to apply insecticides
at the beginning of warm weather (70oF and over). |
| First Cover: about one
week after Petal Fall. |
Same as above except for
sawfly. |
Add a miticide where needed. |
| Second Cover: about one
week after First Cover. |
Same as above plus apple
aphid. |
Rust fungicide no longer
needed. |
| Third Cover: about two
weeks after Second Cover, mid-to-late June. |
Scab, fruit rots and spots.
Apple aphids, curculio, codling moth and mites. |
Add a miticide where needed. |
| Fourth to Eight Covers:
apply when needed until early September. |
Scab, fruit rots and spots.
Apple maggot, aphids, mites, leafrollers and codling moth. |
See Apple
Maggot and Its Control for more information on
controlling this insect without insecticides. |
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The information in
this material is for educational purposes. The recommendations contained
are based on the best available knowledge at the time of printing.
Any reference to commercial products, trade or brand names is for information
only, and no endorsement or approval is intended. The Cooperative Extension
system does not guarantee or warrant the standard of any product referenced
or imply approval of the product to the exclusion of others which also
may be available.All agrochemicals/pesticides listed are registered
for suggested uses in accordance with federal and Connecticut state
laws and regulations as of the date of printing. If the information
does not agree with current labeling, follow the label instructions.
The label is the law.Warning! Agrochemicals/pesticides are dangerous.
Read and follow all instructions and safety precautions on labels.
Carefully handle and store agrochemicals/pesticides in originally labeled
containers immediately in a safe manner and place. Contact the Connecticut
Department of Environmental Protection for current regulations.The
user of this information assumes all risks for personal injury or property
damage.Issued in furtherance of Cooperative Extension work, Acts of
May 8 and June 30, 1914, in cooperation with the U.S. Department of
Agriculture. Kirklyn M. Kerr, Director, Cooperative Extension System,
The University of Connecticut, Storrs. The Connecticut Cooperative
Extension System offers its programs to persons regardless of race,
color, national origin, sex, age or disability and is an equal opportunity
employer.
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