Category Archives: Weed Management

Seasonal topics – May 2, 2016

Weed escapes

May 2, 2016 — Some topics are relevant year after year, but you might not always take the time to filter through previous posts to find them. I’ve highlighted some here that might be of interest this week. Click on the preview images below to jump to the articles. Continue reading Seasonal topics – May 2, 2016

Herbicide injury symptoms from PPI herbicides in tomatoes

See updated article (2017) Herbicide injury symptoms in tomatoes.

Dr. Darren Robinson, Ridgetown Campus – University of Guelph; Janice LeBoeuf, OMAFRA, Ridgetown

PDF version

Tomato injury from Dual

Dual does not translocate far in the plant, and injury symptoms occur only in stressed plants in cold, wet weather. If injury does occur, symptoms will include yellowing and curling of the new leaves and petioles.

Tomato injury from Treflan

Tomatoes are particularly susceptible to Treflan/Bonanza/Rival injury on low organic matter soils, or if transplants have been placed too shallow in the soil. Injury symptoms include club roots, stunting and occasionally purpling of leaves.

Weed control with PPI herbicides in tomatoes

Dr. Darren Robinson, Ridgetown Campus – University of Guelph;
Janice LeBoeuf, OMAFRA, Ridgetown

PDF version

Weed control with Dual II Magnum

Dual II Magnum

  • General annual grass weed control
  • Control of eastern black nightshade and suppression of redroot pigweed
  • Lambsquarters escapes

Weed control with Treflan, Bonanza, or Rival

Treflan, Bonanza, Rival

  • General annual grass weed control
  • Suppression of redroot pigweed and common lambsquarters
  • Will not control eastern black nightshade

Resources for vegetable crop scouts

Looking for information relevant to Ontario field vegetable crops? Here’s a list of resources for vegetable crop scouts.

ONvegetables.comCrop Updates

ONvegetables.com

  • Stay current! ONvegetables.com offers timely information on crop production, pest identification, pest control, pest monitoring, weather, changes to pesticide registrations, meetings, conferences, new publications of interest to the vegetable industry, and more.

Continue reading Resources for vegetable crop scouts

Use of Sandea Herbicide in Tomatoes, Vine Crops, and Peppers and Permit in Sweet Corn

Darren Robinson, Weed Researcher, Ridgetown Campus – University of Guelph

Sandea and Permit are Group 2 herbicides that are taken up by roots and shoots and are systemic in the plant.  The herbicides will translocate to the new growing tissues, and if applied to a sensitive crop or weed, it will cause stunting, chlorosis (yellowing) and may even delay maturity of sensitive species.  These herbicides are particularly useful for control of preemergence control of common lamb’s-quarters and postemergence control of yellow nutsedge.  They have also provided good control of common ragweed and redroot pigweed.  The labels should be consulted before use in all cases, and are available at http://www.uap.ca/products/products.htm.

Continue reading Use of Sandea Herbicide in Tomatoes, Vine Crops, and Peppers and Permit in Sweet Corn