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Vegetable Report: August 24-30, 2013

The crop growth and sizing of carrots is good. There appears to be a surge of Aster leafhoppers (ALH), and may in part be due to maturing and harvesting of canola crops nearby. The aster yellows on carrots remains low, but is creeping up a little (1-2% in some areas).  Harvest of the commercial crop has begun; but some fields, which will be harvested later, may need ALH management.
Insect Net Sweeps On Yellow Cards (avg of 2)
(100 sweeps) Aug 29 Trapped in 1 week (Aug 21-29)
Grower 1, Field 1 10 0.5
Grower 1, Field 2 Too wet to enter Too wet to enter
Grower 2, Field 1 50 9.5
Grower 2, Field 2 175 8
Due to rains, moisture will be high within the canopy.  Foliage clipping is a good way to keep adequate air flow between rows and the soil surface and manage sclerotinia rot without use of chemicals.


Clipped foliage of carrots allowing for better air movement

Unclipped foliage of carrots retains moisture longer under canopy


Early blight and Septoria leaf spot diseases are common in field tomatoes.Chlorothalonil (Bravo), copper hydroxide based fungicides (Kocide, Coppercide, Parasol), mancozeb (Manzate, Dithane, penncozeb),  pyraclostrobin (Cabrio) are some of the fungicides which are registered for use.
To-date, there is no late blight report in Manitoba. However, morning dew and often well distributed rains can create late blight favourable niche conditions; hence, please keep scouting for disease and use a regular late blight fungicide application program. Once infected, in favourable conditions, the entire tomato fields could be lost in 3-4 days - so prevention is key.
Wet canopy has favoured appearance of botrytis and sclerotinia rot on the stems in some fields. Serenade is registered for use against botrytis disease on tomato.
Please, always read Pest Control Product - PCP label before using pesticides.

Sclerotinia rot in tomato

Sclerotinia rot in pepper

Crucifer Crops:
Flea beetles continue to be a threat.  Heat in the last few days may have pushed some crucifer crops to flower, especially in market gardens with infrequent irrigation. Blackrot disease on cauliflower was seen in some plants. It is a seed-borne bacterial disease favoured by warm weather and wet conditions. Blackleg, a fungal disease, was also recorded in some crucifer vegetables; it is more commonly seen in canola crops.

Flowered/bolted broccoli
End of Season:
Various vegetables are now being harvested.  Very few diseases could affect production from now until the end of the growing season; the major ones being sclerotinia rot and late blight. Keep scouting and have a great remainder of the production season.
This is the last report for this season.
Compiled by:
Dr. Vikram Bisht, Horticulture Crops Plant Pathologist
Manitoba Agriculture, Food and Rural Initiatives
Phone: (204) 745-0260
Fax: (204) 745-5690
Tom Gonsalves, Vegetable Crops Specialist
Manitoba Agriculture, Food and Rural Initiatives
Phone: (204) 750-1630
Fax: (204) 745-5690

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