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Strawberries Strawberries: Growers have been harvesting day-neutral strawberries for a few weeks, but harvest of June bearing varieties is just beginning in early areas. Harvest will be slow for the first week or so as frost and cool weather have delayed the crop in many areas. The variety Veestar continues to be disappointing and is no longer recommended. Plants are no longer available from the Ontario Plant Propagation program. Disease pressure is high but insect pests are developing slowly. Most growers have applied one insecticide for clipper weevil and plant bug. A second insecticide may be needed if tarnished plant bug populations build up again to threshold levels. Botrytis grey mould infects through damaged tissue. With all the frost damage and rain out there, growers need a tight fungicide schedule for Botrytis during the bloom and petal fall stage. While many growers apply just 2 fungicides to June bearing varieties during bloom in normal conditions, consider applications every 5-7 days in wet weather during bloom. In addition to price, consider relative effectiveness of the fungicide and pressure from other diseases. If you have had anthracnose fruit rot in the past, choose fungicides which will control both diseases. See publication #360, Table 5-18 for information on the relative efficacy of fungicides. Two spotted spider mites were building up a week ago, before this cool weather. This is the time to take a good look for these pests. Check Mira,
Two-spotted spider mite adults, nymphs and eggs and webbing on lower leaf surfaces
Spider mite damage on strawberry leaf A new miticide for strawberries, Oberon is in the same family as Envidor, which is used in tree fruit. It is effective at controlling eggs, nymphs and female adult mites. Treated mite eggs do not hatch, treated nymphs get trapped in their quiescent (or resting) stage and are prevented from emerging to their next stage. Treated female adults do not deposit viable eggs. Oberon is not a knockdown miticide and should be targeted toward the early life stages of mites which are the fastest life stages to develop. One of the significant advantages of Oberon is its long lasting control. It adheres strongly to the waxy surface of the leaf. In strawberries, Oberon has a short re-entry period of 12 hours and a short pre-harvest interval of 3 days. Oberon is a reduced risk pesticide and is soft on beneficials. Miticides Registered on Strawberries
Raspberries: Expect bloom within the week in most areas. Check buds carefully for pests like clipper weevil and raspberry fruitworm. Apply an insecticide such as malathion before bloom if necessary. DO not spray insecticides on raspberries during bloom. Bees are very attractive to raspberry bloom. Admire 240 SC is now registered on raspberries, for pest control after bloom. This product will control raspberry caneborer, and leafhoppers. The timing of this product as a soil drench for white grub control is past (30 days to harvest). At this point, it should not be used until after bloom. For information: http://www.omafra.gov.on.ca/english/crops/pub360/sup/p360sup2008-add5.htm#rasp Blueberries: Monitoring for cranberry fruitworm and cherry fruitworm indicate low activity so far. You can use trap catches and degree day models to control these pests efficiently, but in the absence of these pest management tools, plan to spray Malathion, Sevin or Dipel for these pests at petal fall when bees have been removed. Details on cranberry fruitworm control: http://www.omafra.gov.on.ca/english/crops/hort/news/hortmatt/2005/08hrt05a5.htm The Canadian Food Inspection Agency has updated the maps on where blueberry maggot has been detected in Growers should also be on the look out for Blueberry Scorch Virus. Symptoms of this virus disease include leaf and flower blighting, advancing necrosis and eventual death of diseased plants. The disease can be present for up to two years before symptoms develop. This is a good time to look for blossoms which are brown and fail to fall off the bush. http://www.inspection.gc.ca/english/plaveg/pestrava/bbsco/bbscoe.shtml. The Pest Diagnostic Clinic at the New plants can be a source of both blueberry maggot and blueberry scorch virus, so watch new plantings closely. Supplement to OMAFRA publication #360: This update is on line in pdf format so you can print it , or it is available from OMAFRA offices. Contains information on new registrations since March 2008. http://www.omafra.gov.on.ca/english/crops/pub360/sup/p360supjan2009.pdf Growing Forward: http://www.omafra.gov.on.ca/english/about/growingforward/foodsafety.htm Everyone is talking about the funding available from this program for on-farm food safety . In OMAFRA, Jan Schooley is a good contact for on-farm food safety information: jan.schooley@otnario,ca Spray cast: http://www.weathercentral.ca/ Free software to help you plan your spray applications when conditions are good. Put in the locations of your field and boom eight for a three day, hourly forecast of wind speed, direction and spray conditions. Soil Water Management Workshop: June 23 ( Niagara on the Lake) or June 24 ( North American Strawberry Growers Association Summer Tour: August 11-12, 2009, in the Simcoe Vegetable and Alternative Crop Open House, August 18, 2009. 1:30 pm. For information: 519-426-7127 Ext. 323.
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