OMAFRA Report: Dry bean summary for 2021 season

This is a weekly report prepared by the staff of the Ministry of Agriculture, Food and Rural Affairs (OMAFRA).  If you require further information, regarding this report, call the Elora Resource Centre at 519-846-0941.  Office hours: 8:30 a.m. to 4:30 p.m. For technical information, call the Agricultural Information Contact Centre at 1-877-424-1300 or visit the OMAFRA website:

In 2020, Ontario dry bean acres were at their highest since 2007. This year, insured acres of dry beans totalled around 115,000 which is comparable to the 10-year average.

Acreage of each market class declined in 2021, although the decrease in kidney bean acres was relatively small.

Dry beans were planted in good conditions, and many were planted on the early side, in late May or early June. Although there was a light frost after seeding, there were few reports of damaged dry beans needing to be replanted. After a dry start, rains were welcomed in mid- to late-June but in some areas heavy rains contributed to significant injury from root rot complex.

Fields along Lake Huron were extremely yellow and slow growing due to root rot injury, resulting in below average yields.

Insects and Diseases

Western Bean Cutworm (WBC) were abundant again this year, and on average were caught in higher numbers on dry bean fields than on corn fields.

Trap captures for the province peaked at the end of July, a week earlier than in 2020. Captures may peak at different times in individual regions, so it continues to be important to monitor traps on your own fields.

Insecticides should be applied when bean plants have pods and after many of the eggs have hatched, which is 10 to 21 days after traps counts have peaked. This usually means insecticides should be applied between Aug 10 and 21.

Some stink bug activity was reported in dry beans, but insects were not a major concern in dry beans this year.

Producers are asked to report infestations of two-spotted spider mites to OMAFRA in 2022 so that samples can be collected.

Some spider mite populations in Ontario have been found to be resistant to dimethoate (Cygon, Lagon) which is the only active ingredient registered in Ontario for their control.

In a survey of 37 dry bean fields in Middlesex and Huron counties, SCN (soybean cyst nematode) was found on four fields. It is already known to be present on soybean fields in these counties.

Growers are reminded that dry beans are susceptible to SCN and varieties with resistant traits are not available. Adzuki beans are more susceptible to SCN than soybeans and should not be grown on SCN-positive fields.

Persistent wet conditions led to concerns there would be a high incidence of white mould this season, but white mould levels were average.

Most dry bean acres in Ontario are likely to have white mould inoculum but wet, humid conditions and temperatures below 28°C during flowering are also required for infection.

So-called “green patch syndrome,” where plants produce only deformed beans and then remain green after pre-harvest herbicide application, was much less of an issue this year compared to recent years.

A few symptomatic plants are often seen in fields, and are most common in cranberry beans, but this year green patch damage to large areas of fields or whole fields was not reported to OMAFRA. The cause of green patch is undetermined.