Scaffolds Fruit Journal, Cornell University NYSAES

General Information | Insects | Credits

Volume 6, No. 22				  August 18, 1997


                                                     43F       50F
Current DD accumulations (Geneva 1/1-8/18):         2470      1660	        
Coming Events:                              Ranges:
Apple maggot flight peaks                      2033-2688 1387-1804
Comstock mealybug 2nd generation crawlers peak 2350-2649 1642-1736
Spotted tentiform leafminer 3rd flight peaks   2415-3142 1728-2231
Redbanded leafroller 3rd flight peaks          2514-3225 1818-2625
Obliquebanded leafroller 2nd flight peaks      2634-3267 1789-2231

         Geneva: Oriental fruit moth 3rd flight began 8/14.
     Williamson: Comstock mealybug crawlers present 8/15. 
TRAP CATCHES (Number/trap/day)
                                   8/4    8/7   8/11   8/14   8/18
Redbanded Leafroller               0.1    0.3    0.6    0.3      0
Spotted Tentiform Leafminer         45     12     67    112    168
Lesser Appleworm                   0.3    0.5    0.8    3.3    3.4
Oriental Fruit Moth (apple)        0.5    2.2    2.3    6.0    5.8
San Jose Scale                    15.4    3.7   22.8      -    9.9
Codling Moth                       0.6    2.5   17.4    8.3    3.6
American Plum Borer                2.4    1.5    1.8    1.2    1.4
Lesser Peachtree Borer             0.8    0.8    1.4    0.8    2.1
Peachtree Borer                    4.0    1.7      0      0      0
Obliquebanded Leafroller           0.3      0    0.4    0.3    0.1
Apple maggot                       0.2   0.08    0.4    0.3    0.1

Highland (Dick Straub, Peter Jentsch):
                                  7/21   7/28    8/4
Redbanded Leafroller               2.3    2.4    0.7
Spotted Tentiform Leafminer       46.0   28.4   43.5
Oriental Fruit Moth                0.3    0.6    1.2
Lesser Appleworm                   0.9    1.2    1.9
Codling Moth                       1.2    1.0    0.1
Fruittree Leafroller                 0      0      0
Tufted Apple Budmoth                 0    0.4    0.1
Obliquebanded Leafroller           0.1    0.1    0.2
Sparganothis Fruitworm             0.1    0.3      0
Apple Maggot                       0.9    1.1    0.9
Variegated Leafroller              0.4*   0.2    0.3
                                       * = 1st catch

General Information


Don't forget this annual event, sponsored by the Departments of Plant Pathology and Entomology, which has been scheduled for September 3-4 this year. All those interested are invited to attend this preliminary presentation of results of field trials on the control of diseases and insects attacking N.Y. fruit crops. Results will be discussed from experiments on tree fruits and grapes. In Highland, the tour of research plots will take place on Wednesday, September 3, from 9:00 AM until noon. In the Hudson Valley, the fall fruit tour is being held only on alternate years. Thus, although there was not a fall tour here last year, we do plan to host it this year. The next day, September 4, the activities shift to Geneva, where presentations on tree fruits are scheduled for the morning, and grape research plots will be highlighted after lunch. Registration begins at 8:30 at the Hudson Valley Laboratory in Highland (Wednesday, September 3) and at Barton Laboratory, NYSAES, Geneva (Thursday, September 4). See you there.


Summer Flings

by Art Agnello
Entomology, Geneva

As the apple insect season winds down, don't neglect the possibility of the traditional eleventh-hour infestations that can complicate picking efforts and add to the stress on trees that are preparing for their transition to the cooler, non-productive days of fall. We have already seen a few infestations of woolly apple aphids in McIntosh trees, and the weather in coming days is forecast to remain favorable for their buildup.

Aerial colony of wingless adult female woolly apple aphids

Judge the severity of any infestations in your trees, plus the projected harvest dates, and if needed, select a suitable material keeping in mind the respective PHI: Penncap-M (14 or 21 days PHI), Thiodan (21 days), or Lorsban (28 days). Penncap-M and Lorsban will also control apple maggot. This is also prime time for an increase in nymphal populations of white apple leafhopper.

White apple leafhopper adult

An average of more than 2 per leaf can be addressed using Provado (7 days PHI), Sevin (1 day), the aforementioned Thiodan, Lannate (14 days), or Carzol (7 days). Provado and Lannate will also help out on any 3rd brood leafminers and green aphids, Sevin and Lannate will help control apple maggot, and of course Carzol is active against motile mites, although these should be packing it in on their own by now.

Scaffolds is published weekly from March to September by Cornell University - NYS Agricultural Experiment Station (Geneva), and Ithaca - with the assistance of Cornell Cooperative Extension. New York field reports welcomed. Send submissions by 3 p.m. Monday to:

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Photographs courtesy of New York State Integrated Pest Management Program