Dr. Phyto

soybean

Glycine max

Diseases & pests on this plant

• Phytophthora root + stem rot of soybeanPhytophthora sojae

  Damping-off of seedlings in wet cool soils, brown sunken stem cankers extending upward from soil line on older plants, yellowing + wilting of foliage progressing to whole-plant death, root system rotted + decayed, field patches in wet low spots.

• northern stem canker of soybeanDiaporthe phaseolorum var. caulivora

  Reddish-brown lesions at lower nodes on stem, lesions expand upward + downward forming sunken cankers, leaves above canker yellow then die while still attached (flag), whole-plant death in severe attacks, lesions sporulate black fruiting bodies in late season.

• Brown marmorated stink bugHalyomorpha halys

  Shield-shaped brown bug ~17 mm with alternating light and dark bands on the antennae and abdomen edge; feeding causes corky, dimpled, cat-faced distortion on tree fruit, cloudy or necrotic spots on peppers and tomatoes, and shrivelled pods on soybean. Adults gather on and enter buildings to overwinter.

• soybean cyst nematodeHeterodera glycinesEU-notifiable quarantine organism

  Stunted patches of soybean visible from end of row, yellow + premature senescence within patches, small (0.5mm) white-to-yellow lemon-shaped cysts visible on roots when carefully unearthed and washed, severe infestations cause 30-50% yield loss, root system reduced + branched abnormally.