2019 Dry Edible Bean Seasonal Summary

Dec 04, 2019

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Planting and Growing Conditions
 
Acreage of dry beans in 2019 increased approximately 20% over 2018 acreage, with notable growth in acres of white and adzuki beans. Challenging planting conditions for corn and soybeans were likely a factor in the increased acres of dry beans in 2019. The general target for planting dry beans is June 1st or after the last frost, so rather than planting corn and soybeans late producers may have switched some acres to dry beans. Planting of adzuki, the bean that takes the longest to mature, began in earnest around June 1st. June 9th and 10th was the first decent window for many producers to plant field crops including dry beans, but a significant rainfall forecasted for June 11th was a good reason to wait longer on beans. Calendar date for planting dry beans is important for harvest timing, but a heavy rain after planting can significantly reduce rates of emergence because of crusting and is best avoided.
 
Dry bean emergence varied widely. Adequate moisture in many fields resulted in excellent emergence. For others, wet and cool conditions, often below 20° C, resulted in very slow emergence and poor stands. Despite this some producers opted to keep fields with low populations because of the late planting date. Replanting in early July often leads to late harvest in wet conditions, resulting in poor quality beans.
 
It was relatively cool and dry during summer which generally results in good dry bean yields; too much rain or heat is often more stressful for dry beans. Most regions had timely rains during pod fill, however some areas had a very wet start then became overly dry during summer resulting in a stressed crop. Unfortunately, some producers also had hail in early October that caused significant damage to dry bean fields.
 
Insects and Diseases
 
Reports of root rot during early plant growth stages were common. Lack of rainfall in the early flowering stages made producers question whether to apply fungicides to prevent white mould. The risk of white mould was low during early flowering, but there was more rain towards the end of flowering resulting in some late-onset white mould. Overall, fungicide use on dry beans was likely lower this year. There were no reports of issues with anthracnose.
 
Bacterial diseases were not necessarily more abundant this year, but it is important to note that researchers are reporting an increase in incidences of bacterial brown spot (BBS). BBS symptoms look very similar to common bacterial blight (CBB). BBS has many native host plants, so purchasing seed grown in the United States (US) may not reduce the risk of BBS infection and BBS may infect varieties that carry resistance to CBB.
 
Insect pressure was lower this year than in 2018. Potato leafhopper occur every year to some extent, and some producers reached threshold and applied an insecticide. There were a variety of reports of caterpillars and larvae in fields this year (e.g. cloverworm), but typically at low levels.
 
Western bean cutworm (WBC) continues to be a challenge to monitor and manage in dry beans. Peak flight occurred during the same week as last year; at the end of July and beginning of August depending on region. However, WBC moth flight continued later in the season this year and central and eastern Ontario had higher WBC moth counts overall compared to 2018.  Insecticide application is recommended when the following factors have occurred: a total of more than 150 WBC moths are captured in traps, peak flight has occurred and trap captures have started to decline, pods are present on the plants and pod feeding damage has been observed.
Source : Field Crop News