TR : Berry Bulletin: Spotted Wing Drosophila (SWD) Update August 5, 2014
2 views
Skip to first unread message
Lambert Liette (DRMONT-O) (Sainte-Martine)
Aug 5, 2014, 7:00:45 PM8/5/14
to DAT Quebec dat-quebec@googlegroups.com (dat-quebec@googlegroups.com)
Pvi
________________________________________
De : jacquie....@ontario.ca [jacquie....@ontario.ca]
Envoyé : 5 août 2014 13:37
À : jacquie....@ontario.ca
Objet : Berry Bulletin: Spotted Wing Drosophila (SWD) Update August 5, 2014
Spotted wing drosophila (SWD) is being trapped at more locations and in higher numbers. This trend is also occurring in the northeastern US and in southern Quebec. We are finding higher numbers of SWD in traps located in raspberries compared to those in blueberries right now, but both are on the rise. To date, we have trapped SWD in the following counties: Elgin, Essex, Huron, Kent, Oxford, Middlesex, Norfolk, Brant, Haldimand, Niagara, Welland, Halton, Hamilton-Wentworth, York, Durham, Northumberland, Prince Edward, Frontenac and Stormont, Dundas and Glengarry.
All growers in southern Ontario should be taking steps to protect raspberries and blueberries from SWD. This means early, frequent and thorough harvest, immediate cooling of harvested product, and weekly application of insecticides. Early fruit from fall-bearing raspberries should be harvested, even though the harvestable quantities may be small. Instruct workers to remove unmarketable fruit from the field during harvest. Spray coverage is very important in order to prevent SWD buildup in the middle of the crop canopy. Rotate insecticide families where possible to prevent the development of resistance to any single product. Do not spray wild hosts, which are an important refuge for pollinators and other beneficial insects.
Our survey is limited in terms of sites and traps in some parts of Ontario, particularly in eastern and northern berry production areas; we do not have enough information to recommend regional spraying. Growers in eastern and northern Ontario should be on the lookout for signs of SWD and taking steps to minimize damage to berry crops as they mature.
SWD has been reared from wild hosts (honeysuckle, wild black raspberries and wild red raspberries) and crops (raspberries, greenhouse raspberries, sweet cherries and haskaps). It can take a week or two for SWD to complete their development (egg-larva-pupa-new adult), so new adults emerging from wild fruits or crops were laid much earlier. For example, black raspberries collected July 11 had spotted wing emerge July 21, wild raspberries collected July 14 had spotted wing emerge July 24, and sweet cherries collected July 22 had SWD emerge July 29. The emergence trend seems to be 7-10 days post emergence. You can use salt tests to check for the presence of larvae in harvested fruit (http://www.omafra.gov.on.ca/english/crops/facts/swd-monitor.htm). These tests provide important follow-up information on the effectiveness of your management program.
For more information, check out webpages regularly: www.ontario.ca/spottedwing
-------------------------------------------
To unsubscribe from this mailing list go to
http://apps.omafra.gov.on.ca/scripts/english/crops/agriphone/addremove.asp
________________________________________
De : jacquie....@ontario.ca [jacquie....@ontario.ca]
Envoyé : 5 août 2014 13:37
À : jacquie....@ontario.ca
Objet : Berry Bulletin: Spotted Wing Drosophila (SWD) Update August 5, 2014
Spotted wing drosophila (SWD) is being trapped at more locations and in higher numbers. This trend is also occurring in the northeastern US and in southern Quebec. We are finding higher numbers of SWD in traps located in raspberries compared to those in blueberries right now, but both are on the rise. To date, we have trapped SWD in the following counties: Elgin, Essex, Huron, Kent, Oxford, Middlesex, Norfolk, Brant, Haldimand, Niagara, Welland, Halton, Hamilton-Wentworth, York, Durham, Northumberland, Prince Edward, Frontenac and Stormont, Dundas and Glengarry.
All growers in southern Ontario should be taking steps to protect raspberries and blueberries from SWD. This means early, frequent and thorough harvest, immediate cooling of harvested product, and weekly application of insecticides. Early fruit from fall-bearing raspberries should be harvested, even though the harvestable quantities may be small. Instruct workers to remove unmarketable fruit from the field during harvest. Spray coverage is very important in order to prevent SWD buildup in the middle of the crop canopy. Rotate insecticide families where possible to prevent the development of resistance to any single product. Do not spray wild hosts, which are an important refuge for pollinators and other beneficial insects.
Our survey is limited in terms of sites and traps in some parts of Ontario, particularly in eastern and northern berry production areas; we do not have enough information to recommend regional spraying. Growers in eastern and northern Ontario should be on the lookout for signs of SWD and taking steps to minimize damage to berry crops as they mature.
SWD has been reared from wild hosts (honeysuckle, wild black raspberries and wild red raspberries) and crops (raspberries, greenhouse raspberries, sweet cherries and haskaps). It can take a week or two for SWD to complete their development (egg-larva-pupa-new adult), so new adults emerging from wild fruits or crops were laid much earlier. For example, black raspberries collected July 11 had spotted wing emerge July 21, wild raspberries collected July 14 had spotted wing emerge July 24, and sweet cherries collected July 22 had SWD emerge July 29. The emergence trend seems to be 7-10 days post emergence. You can use salt tests to check for the presence of larvae in harvested fruit (http://www.omafra.gov.on.ca/english/crops/facts/swd-monitor.htm). These tests provide important follow-up information on the effectiveness of your management program.
For more information, check out webpages regularly: www.ontario.ca/spottedwing
-------------------------------------------
To unsubscribe from this mailing list go to
http://apps.omafra.gov.on.ca/scripts/english/crops/agriphone/addremove.asp
Reply all
Reply to author
Forward
0 new messages