The Bean Report – July 5, 2023

Soybeans range from V5 to R2 (open flowers on one of the uppermost 4 nodes).

• Ensure inoculation strategies were successful ahead of pod development and filling stages by checking up on soybean nodulation. Assess soybean nodulation →
• Hail has hit several soybean fields. At R1 stages, yield loss depends on the amount of defoliation and stem nodes removed. More information below.

Field peas range from R1 (flower buds) to R3 (flat pod).

• Symptoms of Mycosphaerella (Ascochyta) blight are more common to find in the lower pea canopy. Fungicide applications are on-going. Fungicide Decisions in Peas →
• Bacterial blight is also present in some fields, following storm damage.
• Pea aphids are present at low levels in some pea fields. Scouting for Pea Aphids →
• When digging up pea roots in western Manitoba to check nodulation, you may find pea leaf weevil larvae and pupae in the soil. This pest feeds on root nodules below-ground. High numbers have been noted in northwestern Manitoba and in areas north of #1 Hwy in western Manitoba.

Dry beans range from V4 to R1.

• In fields with a history of dry beans, active root nodules are present in some fields. Dig up your dry bean roots to check for nodulation.
• Potato leaf hoppers are a pest of dry beans. Triangular brown areas at the tips of leaves or dwarfed, crinkled leaves are a sign of hopper burn. Examine the undersides of leaves to look for potato leaf hoppers and determine the number per trifoliate on average. At V4, the economic threshold is 1 leaf hopper/trifoliate and at R1 is it 2 leaf hoppers/trifoliate.
• Fungicide Options