Northern Michigan FruitNet 2009
Weekly Update
NW Michigan Horticultural Research Station
| Nikki Rothwell District Horticulturist |
Erin Lizotte District Fruit IPM/IFP Agent |
Bill Klein Farm Mgr, NWMHRS |
| Duke Elsner Agricultural & Regional Viticulture Agent |
August 18, 2009
GROWING DEGREE DAY ACCUMULATIONS AS OF August 17th AT THE NWMHRS
Year |
2009 |
2008 |
2007 |
2006 |
2005 |
2004 |
19yr. Avg. |
GDD42 |
2376 |
2564 |
2957 |
2947 |
2996 |
2320 |
2646.3 |
GDD50 |
1457 | 1652 | 1978 | 1951 | 2036 | 1402 | 1718.8 |
Growth Stages at NWMHRS (8/17/09- 4:30 p.m.)
Apple: McIntosh – 64 mm fruit
Yellow Delicious – 59 mm fruit
Gala – 51 mm fruit
Red Delicious – 62 mm fruit
Pear: Bartlett: 44 mm fruit
Plum: 35 mm fruit
Grapes: Berry touch
Pest Report
Apple: We caught no apple maggot for the second week in a row. Spotted tentiform leafminer emergence continues in high numbers for the fourth week in a row with 100’s per trap this week. Codling moth numbers remain low with an average of two moths/trap this week. Obliquebanded leafroller (OBLR) emergence has dipped with an average of 5 per trap in apple sites. Oriental fruit moths are averaging 10 per trap. Susceptible apple varieties are showing significant apple scab infections with fruit scab not uncommon around the region.
Cherry: Obliquebanded leafroller numbers are down this week with an average of 5 moths per trap. Lesser peachtree borer numbers remain steady with an average of 16 per trap. Greater peachtree borer also continue to emerge with an average of 2 moths/trap and American plum borer averaged 6 moths per trap. In one block, we caught hundreds of cherry fruit fly for the third week in a row. Much of the region’s weather stations have recorded three moderate cherry leaf spot infection periods over the past week. Cherry leaf spot symptoms are quickly becoming visible and intense in treated and untreated tarts around the region. Post harvest applications of chlorothanlonil are recommended under high pressure. Post harvest applications have been shown to push the date of defoliation back allowing trees to properly reallocate carbohydrates to the root system.
Winegrapes: Grapes continue to grow and most area vineyards are at berry touch. Grape berry moth pressure seems low around the region, with only one of our scouted vineyards recording a trap catch of 4 moths. Based on a biofix of wild grape bloom on June 19th, the grape berry moth model has accumulated 1,138 DD42 of the 1,620 DD42 that may be the timing of egglaying for the current generation. We are seeing very little powdery mildew, but growers should be on the lookout for symptoms as conditions have been favorable for disease development. Increased numbers of potato leafhopper (nymphs and adults) were also spotted this week.
NORTHWEST STATION 30TH ANNUAL OPEN HOUSE
Schedule
1:00-3:00 p.m. Equipment Show
3:00 All groups meet in NWMHRS conference room
3:00-3:20 Introduction to new irrigation system at NWMHRS, Dr. Nikki
Rothwell, NWMHRS
3:20-3:30 Meet the new NW Farm Management Educator, Curtis Talley, MSU-E
Tree Fruit Session
3:30 Board wagons for sweet cherry pathology trials
3:35-4:05 Latest updates for tree fruit diseases, Dr. George Sundin, Dept. of
Plant Pathology
4:05-4:15 Sweet cherry tunnel research update, Dr. Greg Lang, Dept. of Horticulture
4:15-4:30 Introduction to stem-on project, Dr. Nikki Rothwell
4:30-4:35 Board wagon for entomology block
4:35-4:50 What’s new on Enviroweather for fruit growers?, Beth Bishop,
Enviroweather Coordinator
4:50-5:15 Tart cherry RAMP update, Dr. Mark Whalon, Dept. of Entomology, Dr. Nikki
Rothwell and Erin Lizotte, NWMHRS
Winegrape Session
3:30-5:00 Winegrape breeding, vineyard establishment, refurbishing old vineyards, and grafting, Dr. Krasokhina and Dr. Khisamutdinov, Russian Academy of Agricultural Sciences
5:15-6:00 Social hour with wine tasting
6:00- Dinner and Leelanau Horticultural Society annual meeting
Dinner, to be catered by Epicure Catering of Omena, will feature local produce and is available for $12 per person for those who have made advance reservations or purchased at the door for $15.
Insect and disease predictive information is available at:
http://www.enviroweather.msu.edu/home.asp
http://www.agweather.geo.msu.edu/agwx/forecasts/fcst.asp?fileid=fous46ktvc
http://www.cherries.msu.edu/
Fruit CAT Alert Reports
http://www.ipmnews.msu.edu/fruit/
This issue and past issues of the weekly FruitNet report are posted on our website at: http://www.maes.msu.edu/nwmihort/faxnet.htm
ACTUAL
AND PREDICTED DEGREE-DAY
ACCUMULATIONS
SINCE MARCH 1, 2009
Please send any comments or suggestions regarding this site
to:
Bill Klein, kleinw@msu.edu
Last Revised: 8-18-09
