Root, bulb, leafy and brassica vegetable pest report – 13 May 2013

See below for the degree days accumulated from April 1st until May 12th, 2013. These values are provided as guidelines only and provide an estimate of activity and development stages of certain insect pests in the field.  Local environment/climate/conditions, soil type, field history, etc. are likely to influence activity and presence of these pests in the field. 

Thresholds for emergence of first generation onion maggot fly adults have been reached for Bradford/Holland Marsh, London, Windsor, Thedford, Delhi and Ridgetown. If resident populations are present, carrot rust fly adults may start to emerge in the Windsor area in a couple days and are likely to emerge over the next 5-7 days in Bradford/Holland Marsh, London, Thedford and Ridgetown areas. If resident populations are present, carrot weevil have likely started to lay eggs in Bradford/Holland Marsh, London, Thedford, Windsor and Ridgetown areas. Tarnished plant bug nymphs may have emerged in Bradford/Holland Marsh, London, Windsor, Thedford, Delhi and Ridgetown already and will soon emerge in Wellington. Overwintering leafhopper eggs have likely started to hatch in the Windsor area and will soon hatch in London and Thedford areas.

Area

Onion Maggot (base 4)

Cabbage Maggot (base 6)

Carrot Rust Fly (base 3)

Carrot Weevil (base 7)

As of

Bradford/Holland Marsh*

224.2

256.5

142.8

12/05/2013

London

227.9

172.1

259.2

147.9

12/05/2013

Wellington

189.9

138.6

219.3

116.9

12/05/2013

Windsor

265.2

201.8

300.8

173.6

12/05/2013

Thedford

221.2

166.2

253.3

144.2

12/05/2013

Delhi

207.3

152.4

238.8

127.9

12/05/2013

Ridgetown

220.1

162.6

252.8

136

12/05/2013

 

Area

Tarnished Plant Bug (base 12)

Leafhopper (base 9)

GDD (base 5)

As of

Bradford/Holland Marsh*

51.5

99.2

195.5

12/05/2013

London

56.8

106.2

198.7

12/05/2013

Wellington

35.8

79.1

162.5

12/05/2013

Windsor

67.8

124.2

232.2

12/05/2013

Thedford

52

103.2

191.9

12/05/2013

Delhi

36.7

84.8

178.6

12/05/2013

Ridgetown

44.1

93.9

190.2

12/05/2013

Data provided by Environment Canada.

*Data provided by Muck Crops Research Station, University of Guelph.

Degree day model information for pests 

Thresholds

 

1st Generation

2nd Generation

3rd Generation

Onion Maggot

210

1025

1772

Cabbage Maggot

314-398

847-960

1446-1604

Carrot Rust Fly

329 – 395

1399-1711

n/a

Carrot Weevil

138-156 (first egg-laying)
455 (90% of eggs laid)

No model available

n/a

Tarnished Plant Bug

40

n/a

n/a

Aster Leafhopper

128 (overwintering egg hatch)

390 (local adult emergence)

n/a

n/a

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