GROWING DEGREE DAY ACCUMULATIONS through Aug. 21st at the NWMHRS

Year          2000      1999      1998      1997
GDD42      2734      2984      3061      2438
GDD50      1702      1962      2017      1554

WEATHER
By Jim Nugent

We could sure use some rain!

Evaporation and rainfall rates at the NWMHRS are as follows (for irrigation scheduling purposes we have included the 75% of evaporation vs. rainfall calculation):
 

	Evaporation	Rainfall	Evaporation less Rainfall	75% of Evaporation	75% Evaporation less Rainfall
Past 2 weeks	2.35	1.30	1.05	1.76	0.46
Past 4 weeks	4.95	2.89	2.06	3.71	0.82
Since May 1	25.87	10.60	15.27	19.40	8.80

PESTS AND DISEASES
By Gary Thornton, District Fruit IPM Agent

Tart cherry trees with high populations of two spotted spider mites only have until about Sept. 7^th to put up with them.  After that the adults will be turning orange and leaving the trees.  Miticides at this time would only be warranted on stressed young trees.  Post harvest fungicide sprays should be completed by now.

Apple growers should be seeing the second generation of codling moth adult flight now.  The trap catches at the NWMHRS for this week were 3 per trap, down from last week's 11 per trap. Growers should continue to monitor these closely.  Apple maggot remain a threat, with the trap catches down to less than 4 per trap in the abandoned orchard we have been monitoring.  Trap catches of spotted tentiform leafminer remained high, with 1100 per trap at the NWMHRS.  They are in all stages now, control should only be considered where mines are greater than 3/leaf. 

Bulls eye rot was a problem for some apples last year.  This rot shows up in storage. Benlate and Ziram are both effective on a protectant basis for controlling this disease and should be applied to blocks that had the problem last year.  The preharvest interval is 14 days on both of the materials.

Bartlett pears should escape the threat of codling moth, where flight was light in recent weeks, since harvest for processing will be next week.  Later varieties of pear remain susceptible.

MISCELLANEOUS

NW Research Station Annual Open House

The annual Open House at the NW Michigan Horticultural Research Station will be held this year on Thursday, August 31st. As usual, the program is being held in conjunction with the Leelanau Horticultural Society's annual meeting.  There is no equipment show this year (the equipment show is every other year). 

The afternoon's educational format will have concurrent programs, in the field and possibly in the Station's conference room.  Growers will move to various locations to attend the programs of their choice.  The Open House educational program will begin at 2:00 p.m. with the first of the concurrent sessions beginning at 2:15 p.m.  The concurrent programs will be scheduled or four 30-minute time slots, with 15 minutes in between, ending at 5:00 p.m. 

From 5:00 to 6:00 p.m. there will be a social hour, and from 6:00 to 7:00 p.m. the Leelanau County Horticultural Society will hold a barbecue, followed by a short annual meeting and award presentations.  Tickets for the barbecue will be available at the door for $15. 

Sponsors for the Open House are the Michigan Agricultural Experiment Station, MSU Extension, the Northwest Michigan Horticultural Research Foundation and the Leelanau Horticultural Society.

FINAL TART CHERRY HARVEST REPORT

If you are interested in the weekly CIAB raw product report, you can access it at CIAB's website: www.cherryboard.org
 
 

Please send any comments or suggestions regarding this site to: 
Bill Klein, kleinw@pilot.msu.edu

Last Revised:8-23-00