July 17, 2006 Volume 15 No. 18 Update on Pest Management and Crop Development
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Upcoming Pest Events | Trap Catches | Pest Focus | Insects
Upcoming Pest
Events | Trap Catches | Pest
Focus | Insects
Upcoming Pest Events | Trap Catches | Pest Focus | Insects GENEVA: San Jose Scale 2nd flight increasing. HIGHLAND: First Stink Bug feeding observed on apple
Upcoming Pest Events | Trap Catches | Pest Focus | Insects
Geneva Predictions: Dogwood Borer Codling Moth Oriental Fruit Moth Redbanded Leafroller Spotted Tentiform Leafminer
Insect model degree day accumulations: DD43 since 1st Obliquebanded
Leafroller catch (90% hatch @ 810, 100% hatch @ 950):
Obliquebanded Leafroller According to our developmental models, the first summer brood should be closing in on completing its hatch throughout the state this week. Orchards with historically high OBLR pressure should have received a first application of a suitable material during the first week of July, and this week would be an advisable time to make a second application against the larvae of this brood. Spintor is an appropriate choice, particularly in cases where the larvae are a bit larger, and a B.t. product such as Dipel, or else the IGR Intrepid are also options, but these tend to be more effective when applied against the earlier stages. Regardless, we have found that this specific spray is the most critical for preventing fruit-feeding damage at harvest, so put this at the top of your list of priorities if OBLR has dogged you in the past. Apple Maggot Trap catches in the state are building steadily, and the combination of heat plus adequate (!) moisture assures us a very respectable flight this season. If you aren't monitoring in specific orchards and haven't yet applied a protective spray against AM (and aren't using SpinTor for OBLR), prudence would suggest some attention to this pest. Hanging a few volatile-baited sphere traps on the edge of susceptible plantings can provide a world of insight on when (and whether) immigrating flies are posing a threat. Growers on a SpinTor program should be somewhere between the first and second spray of this material for leafrollers, which will provide protection against moderate AM pressure. For those not using OP cover sprays, Assail and Calypso will both provide excellent control of apple maggot as well as internal leps. Western Flower Thrips This formerly rare pest has been a recent cause of damage to nectarines and peaches in the Hudson Valley. Originally limited to western North America, this is now a cosmopolitan species that is a key pest in the greenhouse production of flowers and vegetables. Apparently, drought conditions and high temperatures encourage damaging populations that can affect stone fruit crops, particularly nectarines and peaches. The following information is taken from the PA Tree Fruit Production Guide: "...just prior to and during harvest,...adults move from alternate weed or crop hosts to fruit. [They] feed on the fruit surface in protected sites, such as in the stem end, the suture, under leaves and branches, and between fruit. Feeding ...results in silver stipling or patches.
Silvering injury is particularly obvious on highly colored varieties. Because Lannate has a short preharvest interval (4 days), it can be used to control thrips during harvest." Also, SpinTor can be used within 14 days of harvest. An application after the first harvest may prevent subsequent losses; however, an additional application may be needed if thrips pressure is severe. Mites European red mite eggs are present on the foliage right now, and with our sultry temperatures, the period from egg deposit to hatch and multiply is a very short one. A few orchards we have seen are in ERM trouble so far, but also keep in mind the potential for two-spotted mite, which can reach alarming levels in a hurry under high-temperature conditions. Inspect your leaves using the 5 mite/leaf form on p. 83 of the Recommends, and be aware that two-spot populations increase more quickly than ERM, so be conservative in your interpretations. Zeal and Kanemite are good options to keep in mind if treatment is needed; Acramite tends to be more effective against TSSM than ERM, and Nexter works better against red mites than it does on two-spots, but the main advice is to get out there and look at your foliage. 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. 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: Scaffolds
Fruit Journal Online at <http://www.nysaes.cornell.edu/ent/scaffolds/> Return to top
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