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August 30, 2004 Volume 13 No. 24 Update on Pest Management and Crop Development

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Coming Events

Coming Pest Events | Trap Catches | Insects | General Info

Current DD accumulations
43°F
50°F

(Geneva 1/1-8/30):

2922

1936

(Geneva 1/1-8/30/2003):

2897

1959

(Geneva "Normal"):

2977

2087

(Geneva 9/6 Predicted):

3099

2064

 

Coming Events:

Ranges:

 

Apple maggot flight subsides

2772-3374

1908-2368

Oriental fruit moth 3rd flight peak

2641-3249

1821-2257

STLM 3rd flight peak

2599-3055

1776-2134

Lesser appleworm 2nd flight peak

2315-3295

1554-2292

OBLR 2nd flight peak

2615-3023

1779-2117

Redbanded leafroller 3rd flight peak

2742-3222

1876-2342

Peachtree borer flight subsides

2523-3191

1708-2232

San Jose scale 2nd flight subsides

2639-3349

1785-2371

 

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Trap Catches

Coming Pest Events | Trap Catches | Insects | General Info

TRAP CATCHES (Number/trap/day)
Geneva

8/9

8/16

8/23

8/30

Redbanded Leafroller

0.4

0.0

0.1

0.4

Spotted Tentiform Leafminer

7.5

16.7

10.8

16.8

Oriental Fruit Moth

0.4

0.1

0.4

0.1

Lesser Appleworm

0.0

0.2

0.3

0.1

Codling Moth

0.0

0.0

0.1

0.0

San Jose Scale

0.0

0.0

0.0

0.0

Obliquebanded Leafroller

0.4

0.3

0.5

1.1

American Plum Borer

1.8

1.1

0.9

0.6

Lesser Peachtree Borer

0.1

0.1

0.6

0.4

Peachtree Borer

1.3

1.7

0.9

0.0

Apple Maggot

0.3

0.5

0.6

0.0

Highland (Dick Straub, Peter Jentsch):

8/2

8/9

8/16

8/23

Redbanded Leafroller

0.1

0.2

0.6

1.0

Spotted Tentiform Leafminer

29.6

16.6

15.9

8.5

Oriental Fruit Moth

0.4

0.2

0.4

1.8

Codling Moth

0.4

0.2

0.1

0.1

Lesser Appleworm

2.0

1.2

1.9

3.1

Obliquebanded Leafroller

0.1

0.1

0.0

0.0

Sparganothis Fruitworm

0.2

0.2

0.4

0.4

Tufted Apple Bud Moth

0.0

0.0

0.0

0.0

Variegated Leafroller

0.2

0.2

0.1

0.0

Apple Maggot

0.3

0.3

0.7

0.5

* = 1st catch

 

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Insects

Coming Pest Events | Trap Catches | Insects | General Info 


RIDING OUT THE PHOTOPERIOD
(Art Agnello, Entomology, Geneva)

   Probably no one is prepared to conclude that we've gotten into a rut with two of these cool, wet summers in as many years, but continuity does tend to play a role in the occurrence of certain insect problems, and we have tried to be mindful this year that most pest occurrences tend to revert ultimately to some long-standing norm if you wait long enough.  If we were cynics, we'd speculate that nothing ensures a problem's recurrence more than tending not to pay attention to it, but for now we'll merely observe that very few of the traditional pest insects turned up in numbers we were expecting this season, especially after seemingly taking the 2003 season off.

   So, to be cautious, we're not ruling out the possibility that, for instance, blocks with a history of internal worm problems might need a last-minute application of a short-PHI material to help stave off the final feeding injury caused by young larvae.  Before the harvest period begins in earnest, a fruit examination could help determine whether the last brood of any of the likely species needs a final deterrent before the sprayer is put away.  Some thought might be given to using an alternative material such as a B.t., a pyrethroid, Assail, or a sprayable pheromone, as appropriate.

PEARLEAF BLISTER MITE

   Another season-end problem that may deserve attention now is this sporadic pest of pears that shows up in a limited number of commercial pear orchards and is a fairly common problem in home plantings.  The adults are very small and cannot be seen without a hand lens; the body is white and elongate oval in shape, like a tiny sausage.  The mite causes three distinct types of damage.  During winter, the feeding of the mites under the bud scales is believed to cause the bud to dry and fail to develop.  This type of damage is similar to and may be confused with bud injury from insufficient winter chilling.  Fruit damage is the most serious aspect of blister mite attack.  It occurs as a result of mites feeding on the developing pears, from the green-tip stage through bloom, causing russet spots.  These spots, which are often oval in shape, are usually depressed with a surrounding halo of clear tissue.  They are 1/4-1/2 inch in diameter and frequently run together.  A third type of injury is the blistering of leaves; blisters are 1/8-1/4 inch across and, if numerous, can blacken most of the leaf surface.  Although defoliation does not occur, leaf function can be seriously impaired by a heavy infestation.

   The mite begins overwintering as an adult beneath bud scales of fruit and leaf buds, with fruit buds preferred.  When buds start to grow in the spring, the mites attack developing fruit and emerging leaves.  This produces red blisters in which female blister mites then lay eggs.  These resulting new colonies of mites feed on the tissue within the protection of the blister, but they can move in and out through a small hole in its center.  The mites pass through several generations on the leaves but their activity slows during the warm summer months.  The red color of the blisters fades and eventually blackens.  Before leaf fall, the mites leave the blisters and migrate to the buds for the winter.

   For those plantings that might be suffering from this errant pest, a fall spray is recommended sometime in early October, when there is no danger of frost for at least 24-48 hr after the spray.  Use Sevin 50 WP (2 lb/100), or 1-1.5% oil plus either Diazinon 50WP (1 lb/100 gal) or Thiodan/Thionex 50WP (1/2-1 lb/100 gal).  A second spray of oil plus Thiodan, in the spring, just before the green tissue begins to show, will improve the control.

 

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General Info

Coming Pest Events | Trap Catches | Insects | General Info 

FINAL REMINDER - TREE FRUIT PEST CONTROL FIELD DAY

   Please remember to make plans to attend the annual N.Y. Fruit Pest Control Field Day, which will take place during Labor Day week on Sept. 9 and 10.  This year, as we did last year in order to accommodate participants who may wish to attend other area tours earlier in the week, the dates have been shifted to the Thursday and Friday of the week, AND the Geneva installment will again take place first (Thursday Sept. 9), with the Hudson Valley installment on the second day (Friday Sept. 10).  Activities will commence in Geneva on the 9th, with registration, coffee, etc., in the lobby of Barton Lab at 8:30 am.  The tour will proceed to the orchards to view plots and preliminary data from field trials involving new fungicides, miticides, and insecticides on tree fruits and grapes.  It is anticipated that the tour of field plots will be completed by noon.  On the 10th, participants will register at the Hudson Valley Laboratory starting at 8:30, after which we will view and discuss results from field trials on apples.

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This material is based upon work supported by Smith Lever funds from the Cooperative State Research, Education, and Extension Service, U.S. Department of Agriculture. Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the view of the U.S. Department of Agriculture.

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