2019 Fruit Pest Update
September 9, 2019
2019 – 2020 Midwest Fruit Pest Management Guide
Apple maturity reports will be published weekly on the Peninsular Agricultural Research Station website
https://peninsular.ars.wisc.edu/apple-cherry-pest-update/
As we approach harvest, make sure to double check the preharvest interval for any product you might use!
INSECT & DISEASE CONTROL
APPLE
Disease Pressure – An increase in moisture over the last couple weeks is resulting in late-season apple scab pressure. If you choose to use a fungicide, it is recommended to use one labeled for sooty blotch and fly speck as well.
Insect Pressure – There were low levels of codling moth and apple maggot caught over the last week. If you are still catching apple maggot in your orchard, a final insecticide application may be necessary. Wooly apple aphids have been observed in low numbers in orchards with lots of shade and poor airflow in the lower limbs. The best time to control this pest is early season (pink to petal fall). Dock sawfly may begin to emerge, especially in orchards with poor weed control. It is not recommended to use an insecticide to control this pest, because it’s activity is too unpredictable. If you notice damage after harvest, consider improving weed management next year to prevent problems.
Final fruit drop suppression sprays can still be applied if the preharvest interval allows for enough time before harvest. Color development is ahead of what we would expect based on apple maturity. Make sure to perform other tests for maturity rather than relying on color alone. It is too late to do any additional summer pruning at this time, because the fresh cuts need adequate time to harden off before the winter.
CHERRY
Disease Pressure – If a final post-harvest fungicide application was put out, leaves should stay on the trees through the fall which will keep them healthier going into the winter.
Insect Pressure –Even though spotted wing drosophila continue to be caught in traps, insecticide applications should stop. Continuing to spray insecticides after harvest could actually speed up the development of insecticide resistance
GRAPE
Check out the Fruit News for grape maturity information. Nets or other bird deterrents should be in place by now since most varieties are past veraison.
Wisconsin Fruit News:
This week in WI Fruit News
Brian Smith of UW-River Falls reports on his research on strawberry hybrids, stone fruit hybrids, and cold-hardy grapes.
Updates from the UW-Madison, Division of Extension Plant Disease Diagnostic Lab and the Insect Diagnostic Lab.
Brix is increasing in grapes. Find out more in the grape variety developmental stages and fruit maturity evaluation.
The grape scouting report says grape phylloxera galls continue to be observed on all cultivars at the research stations.
Wisconsin Fruit News Volume 4, Issue 10
Grape variety developmental stages and fruit maturity evaluation
Tissue analysis to determine nutrient status of cold-hardy wine grapes
Grape scouting report: Japanese beetle and grape phylloxera continue to be present
Rainfastness characteristics of insecticides
Leaf tissue analysis for berry crops- Now is the time
New tool for predicting bitter pit in Honeycrisp apples
UW-Madison/Extension Insect Diagnostic Lab Update
UW-Madison/Extension Plant Disease Diagnostic Clinic Update
Wisconsin Fruit News Vol. 4 Issue 7
- Plant Disease Diagnostic Update
Insect Diagnostic Lab Update
Apple Sooty Blotch and Flyspeck
Black Stem Borer
Strawberries Post-Harvest: Renovation or Rotation?
Grape Variety Developmental Stages
Grape Scouting Report: Grape Phylloxera or Grape Scale?
Door County Report
WFN- Vol. 4, Issue 6 (June 21, 2019) We are updating our website, so please click on the links to read these articles.
- Governor Evers Declares Wisconsin Vineyard Week, July 14-20
- Grape Scouting Report: Low Insect Pressure
- Grapevine Phenology for Mid-June
- Promoting Return Bloom in Apples
- Some Cold, Hard Facts about Winter Injury on the First Day of Summer
- Door County Report
Links to individual Enviro-Weather stations:
Kewaunee/Stangelville Kewaunee/Casco
Southern Door/Nasewaupee Southern Door/Sturgeon Bay