VCR: Vegetable Crop Report – May 30, 2018

Temperature – In almost all areas across the province, the temperature in April was below average and the accumulated growing degree days lagged behind the 10-year average. May has been a different story. Since the beginning of May, these crop degree days have accumulated quickly and nearly all regions across the province have now equaled or surpassed their average DD accumulation for this time of the year. Region specific information can be found below.

Rainfall – We had an average amount of rainfall in March of this year. April was wet in South Western Ontario with all regions above average and some receiving double the average monthly rainfall. May has continued on that trend with many regions above their average rainfall amounts with a few days to go yet.

Crop Updates

Brassica Crops – The degree day threshold for cabbage maggot emergence has not been reached in most areas of the province. It is likely that emergence will happen in the next few days in the Southern tip of the Province.

Carrots – The bulk of carrots have been seeded and early seeded fields are up and growing. This recent stretch of warm weather could be an issue for recently seeded fields and cause some inconsistent germination. Recently emerged carrots are also susceptible to heat canker and burn off in hot weather.

Garlic – Despite the late spring, garlic growth has caught up to previous years with some fields South of London showing scape emergence. Seedcorn maggot damage has been observed in several fields over the past two weeks. The first flight of leek moth is active in areas where leek moth is established. Check stressed plants for mites on the outside of the bulb.

Onion – After a late start all onion fields have been seeded, with a few transplant fields to go. In general, seeded fields are at the flag to first leaf stage with some fields still in the loop stage. Onion and seedcorn maggot flies are active in most areas of Southwestern Ontario. Current trap counts for onion maggot flies in Exeter are low.

Potatoes – After a delayed start, planting has pretty much wrapped up in many areas across the province. Fields that have emerged are growing quickly and the crop is looking good in many parts of South Western Ontario. The risk of survival for volunteer potatoes has been reported as high in Michigan. Be on the lookout for any volunteers as a potential source for late blight inoculum.

Select a region below for the latest weather, crop and pest degree day information:

Essex County
Chatham-Kent County
Norfolk County
Huron County
Wellington County
Simcoe County
Durham County
Peterborough
Kemptville
Sudbury

 

 

Essex County

Location	Onion Maggot	Seedcorn Maggot	Cabbage Maggot	Leak Moth	Carrot Weevil	Carrot Rust Fly	Aster Leafhopper
Essex	382	382	299	240	262	430	198
For reference on the various thresholds, see table at the very bottom of this post.

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Chatham-Kent County

Location	Onion Maggot	Seedcorn Maggot	Cabbage Maggot	Leak Moth	Carrot Weevil	Carrot Rust Fly	Aster Leafhopper
Chatham-Kent	362	362	285	233	253	408	191
For reference on the various thresholds, see table at the very bottom of this post.

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Norfolk County

Location	Onion Maggot	Seedcorn Maggot	Cabbage Maggot	Leak Moth	Carrot Weevil	Carrot Rust Fly	Aster Leafhopper
Norfolk	363	363	288	229	253	405	190
For reference on the various thresholds, see table at the very bottom of this post.

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Wellington County

Location	Onion Maggot	Seedcorn Maggot	Cabbage Maggot	Leak Moth	Carrot Weevil	Carrot Rust Fly	Aster Leafhopper
Wellington	311	311	241	195	209	350	152
For reference on the various thresholds, see table at the very bottom of this post.

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Huron County

Location	Onion Maggot	Seedcorn Maggot	Cabbage Maggot	Leak Moth	Carrot Weevil	Carrot Rust Fly	Aster Leafhopper
Huron	301	301	232	188	201	339	188
For reference on the various thresholds, see table at the very bottom of this post.

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Simcoe County

Location	Onion Maggot	Seedcorn Maggot	Cabbage Maggot	Leak Moth	Carrot Weevil	Carrot Rust Fly	Aster Leafhopper
Simcoe	297	297	229	34	198	332	143
For reference on the various thresholds, see table at the very bottom of this post.

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Durham County

Location	Onion Maggot	Seedcorn Maggot	Cabbage Maggot	Leak Moth	Carrot Weevil	Carrot Rust Fly	Aster Leafhopper
Durham	304	304	232	39	199	343	142
For reference on the various thresholds, see table at the very bottom of this post.

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Peterborough

Location	Onion Maggot	Seedcorn Maggot	Cabbage Maggot	Leak Moth	Carrot Weevil	Carrot Rust Fly	Aster Leafhopper
Peterborough	304	304	232	33	200	342	143
For reference on the various thresholds, see table at the very bottom of this post.

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Kemptville

Location	Onion Maggot	Seedcorn Maggot	Cabbage Maggot	Leak Moth	Carrot Weevil	Carrot Rust Fly	Aster Leafhopper
Kemptville	313	313	239	49	205	345	141
For reference on the various thresholds, see table at the very bottom of this post.

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Sudbury

Location	Onion Maggot	Seedcorn Maggot	Cabbage Maggot	Leak Moth	Carrot Weevil	Carrot Rust Fly	Aster Leafhopper
Sudbury	236	236	176	35	150	269	104
For reference on the various thresholds, see table at the very bottom of this post.

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Thresholds

Use these thresholds as a guide, always confirm insect activity with actual field scouting and trap counts.

Degree Days
	1st generation	2nd generation	3rd generation
Onion Maggot	210	1025	1772
Seedcorn Maggot	200	600	1000
Cabbage Maggot	314-398	847-960	1446-1604
Carrot Rust Fly	329 – 395	1399-1711	n/a
Leak Moth	445	Egg to adult development after two nights of >9°C
Carrot Weevil	138 – 156	Egg laying (oviposition) begins
	455	90% of the egg-laying (oviposition) is complete
Aster Leafhopper	128	Overwintering eggs hatch
	390	Local adult emergence