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Dry Edible Beans: Green Cloverworm
Excerpt from Agronomy Guide for Field Crops (Chapter 7)Order OMAFRA Publication 811: Agronomy Guide for Field CropsTable of Contents
DescriptionThe adults are dark brown or black moths with spotted wings. Their wingspan is approximately 2.5 cm (1 in.) The larvae are pale green, approximately 2.5 cm (1 in.) in length and have two white longitudinal stripes running along the length of the back. The larvae will pulsate when disturbed. Green cloverworm attack alfalfa, bean, clover, cowpea, soybean, strawberry, vetch, many common weeds and other legumes.
| Top of Page | Life HistoryGreen cloverworm overwinter as pupa in leaf litter and crop debris. Once spring temperatures rise, adults become active and lay eggs on the underside of leaves. Eggs hatch, and the larvae feed on the foliage for approximately 1 month before burrowing into the soil or crop debris to pupate. There are two generations per year. DamageLarvae feed on bean foliage and pods, causing holes and reducing yield if in high numbers. Scouting TechniqueScout 10 plants in five locations across the field. Shake plants over a piece of paper and count the number of larvae found per 30 cm (12 in.) of row. Action ThresholdMore than five larvae per 30 cm (12 in.) of row warrant control. | Top of Page | Management StrategiesSeveral natural enemies help to keep populations below economic thresholds. Insecticides are only recommended if populations are extremely high, as they will also kill the natural enemy population. For more information on insecticide recommendations, refer to OMAFRA Pulication 812, Field Crop Protection Guide. (Order OMAFRA Publication 812) Updates on Dry Edible Beans: Green CloverwormNo updates available at this time. Related LinksFor more information:Toll Free: 1-877-424-1300 Local: (519) 826-4047 E-mail: ag.info.omafra@ontario.ca |
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