Northern Michigan FruitNet 2002
Weekly Update
James E. Nugent Gary E. Thornton William M. Klein
NW Michigan Horticultural Research Station
Michigan State University
GROWING DEGREE DAY ACCUMULATIONS
through July 8th at the NWMHRS:
| 2002 | 2001 | 2000 | 1999 | 1998 | 1997 | |
| Base 42 | 1416 | 1578 | 1609 | 1780 | 1782 | 1305 |
| Base 45 | 1198 | 1324 | 1332 | 1509 | 1504 | 1086 |
| Base 50 | 892 | 948 | 928 | 928 | 1110 | 772 |
WEATHER
Weather conditions have been getting quite dry over the past two weeks. Evaporation rates have been 1.97" and 1.91" per week, while rainfall at the NWMHRS has totaled .05" and .49" per week during the two-week period. These are the two highest weekly evaporation totals for the season.
INSECTS & DISEASES
By Gary Thornton
Apple growers with fireblight in their orchards should continue to cut out strikes. This is particularly important with young trees. Growers should avoid contact with the trees on hot, humid days, as they can further spread the disease. Codling moth trap catches averaged four per trap at the NWMHRS. This first generation should be tapering off now, but growers should continue to monitor closely for this pest. Green apple aphid colonies continue to expand where treatments haven't been applied. The second generation of spotted tentiform leafminer adult flight has begun. Trap catches rose to an average of 106 per trap at the NWMHRS.
Cherry fruit fly emerged at the NWMHRS on Friday, June 25th. Growers who are not monitoring for this pest should apply an appropriate insecticide 7-10 days after this date to insure clean fruit at harvest. Growers who do not plan to harvest can choose to skip this insecticide spray, but keep in mind that insect pressure may be slightly higher next year, due to potential infestation of the few fruit in orchards. Plum curculio adults remain active, although at reduced levels. If harvest will take place, growers should keep a tighter level of control than in the past due to the lack of egg laying sites this year.
Powdery mildew is visible, and controls should be applied in young blocks where long extension growth is desirable. Yesterday's rains resulted in light to moderate infection periods for cherry leaf spot. When possible, growers should use fungicides on a protectant basis to continue to control for this disease. Brown rot is a threat where the crop will be harvested.
Rose chafer adults are still active, but their feeding has declined greatly from their peak.
CIAB AMENDMENTS PASSED
By Jim Nugent
The U.S. Department of Agriculture
announced on July 3rd the passage of all 13 of the proposed
amendments to the Tart Cherry Federal Marketing Order. The amendments will
become effective after
they are published in the
Federal Register. The actual press release is available at http://www.ams.usda.gov/news/153-02.htm.
CIAB WEEKLY REPORT (Taken from the CIAB Weekly Raw Product Report by Perry Hedin)
Tart harvest is nearing completion in PA and began this past week in SW Michigan. Early reports indicate the SW Michigan crop appears lighter than estimated.
CHERRY INDUSTRY PERSON OF THE YEAR
The National Cherry Festival selected Jim Jensen as the 2002 Cherry Industry Person of the Year. Jim was presented today with this distinguished award by the National Cherry Festival and Phil Korson, CMI,. during a special program at the Cherry Connection, NWMHRS. We all wish to congratulate Jim!
WEEKLY EVAPORATION/PRECIPITATION
REPORT
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ACTUAL
AND PREDICTED DEGREE-DAY
ACCUMULATIONS
SINCE MARCH 1, 2002 (*)
Please send any comments or suggestions regarding this site to:
Bill Klein, kleinw@pilot.msu.edu
Last Revised: 7-09-02