April 26th, 1999 Volume 8 No. 6Update on Pest Management and Crop Development
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43F |
50F |
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Current DD accumulations (Geneva 1/1-4/26): |
183 |
69 |
|
(Highland 1/1-4/26): |
316 |
134 |
|
Coming Events: |
Ranges: |
|
|
European red mite egg hatch begins |
157-358 |
74-208 |
|
Green apple aphid present |
127-297 |
54-156 |
|
Green fruitworm flight subsides |
170-544 |
75-280 |
|
Lesser appleworm 1st flight |
135-651 |
49-377 |
|
Obliquebanded leafroller larvae active |
149-388 |
54-201 |
|
Pear thrips in pear buds |
137-221 |
54-101 |
|
Pear psylla 1st hatch |
111-402 |
55-208 |
|
Redbanded leafroller 1st flight peak |
180-455 |
65-221 |
|
Rosy apple aphid nymphs present |
91-291 |
45-148 |
|
Spotted tentiform leafminer 1st oviposition |
141-319 |
48-154 |
|
Spotted tentiform leafminer 1st flight peak |
180-544 |
65-275 |
|
Tarnished plant bug adults active |
71-536 |
34-299 |
|
McIntosh at tight cluster |
188-279 |
68-138 |
|
Peach at pink |
152-269 |
68-119 |
|
Peach at bloom |
229-446 |
95-199 |
|
Pear at green cluster |
188-282 |
68-138 |
|
Pear at white bud |
217-423 |
96-217 |
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Plum at bud burst |
68-234 |
33-108 |
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Plum at green cluster |
170-282 |
75-138 |
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Sweet cherry at white bud |
152-267 |
75-116 |
|
Sweet cherry at bloom |
187-326 |
83-150 |
|
Tart cherry at white bud |
257-326 |
109-149 |
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Phenologies (Geneva): |
Apple (McIntosh): |
Late Half-Inch Green |
|
(Delicious): |
Half-Inch Green |
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|
Pear (Bartlett) : |
Early Green Cluster |
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Sweet Cherry (Windsor): |
Early White Bud |
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Tart Cherry (Montmorency): |
Bud Burst |
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Peach: |
Early Pink |
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(Highland): Apple (McIntosh): |
Early Pink |
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Pear (Bartlett): |
Early White Bud |
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Apricot: |
Petal Fall |
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Peach: |
Late Bloom |
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|
Geneva: |
4/12 |
4/15 |
4/19 |
4/22 |
4/26 |
|
Green Fruitworm |
0.3 |
0.7 |
0.0 |
0.2 |
0.0 |
|
Spotted Tentiform Leafminer |
0.0 |
0.0 |
1.4* |
135 |
1.8 |
|
Redbanded Leafroller |
0.1 |
5.5 |
0.1 |
8.8 |
1.3 |
|
Oriental Fruit Moth |
- |
- |
- |
0.5* |
0.3 |
|
Lesser Appleworm |
- |
- |
- |
- |
0.0 |
|
Highland (Dick Straub, Peter Jentsch): |
3/31 |
4/5 |
4/12 |
4/19 |
4/26 |
|
Green Fruitworm |
2.0 |
0.6 |
0.5 |
0.0 |
0.0 |
|
Spotted Tentiform Leafminer |
0.0 |
<0.1* |
2.4 |
9.1 |
13.2 |
|
Redbanded Leafroller |
3.0* |
9.7 |
10.7 |
20.8 |
20.2 |
|
Oriental Fruit Moth |
- |
- |
- |
- |
0.2* |
|
Codling Moth |
- |
- |
- |
- |
0.0 |
|
European Red Mite (#/leaf) |
- |
- |
- |
- |
0.2* |
* = 1st catch
Geneva: Oriental Fruit Moth 1st catch, 4/22. Cold weather over the
weekend depressed trap catches
Highland: Apple Rust Mites observed. First motile European Red Mites
observed. Oriental Fruit Moth 1st catch, 4/26.
(Dave Rosenberger dar22@cornell.edu & Fritz Meyer fwm4@cornell.edu, Plant Pathology, Highland)
Apple scab ascospore counts as determined from squash mounts:
Tower
|
Date |
Location |
Immature |
Mature |
Discharged |
Discharge |
|
4/18 |
Saratoga |
90% |
10% |
0% |
18 |
|
4/20 |
Peru |
84% |
16% |
0% |
34 |
|
4/20 |
Highland |
82% |
20% |
0% |
179 |
Last week Kevin Iungerman provided leaves from Saratoga and Peru for squash mount assessments. Trees in both locations were between Silver Tip and Green Tip when the samples were collected. In both of those regions, maturity levels were just approaching the point where economically significant discharges can be expected with the next wetting events. Spore maturity appeared slightly more advanced in the Champlain Valley (Peru) than in Saratoga. Ascospore development in the Saratoga area may have been retarded by exceptionally dry conditions that have prevailed in that region. Ascospore maturation can be arrested if the leaf litter that harbors the fungus becomes completely dried out.
In the lower Hudson Valley, scab spores are ready to go but rainfall has been limited. The wetting period that occurred April 15-17 provided the first infection period of the season with 35 hours of wetting at an average temperature of 47°F.
