Today managing your corn crop requires knowledge of the different growth stages of the corn plant. Growth stage identification is critical for scouting and proper timing of fertilizer and pesticide applications. Each week throughout the growing season I will discuss the various corn growth stages and management issue at each stage. This week I will focus on the emergence VE & V1.
WOW, the rain continues!! Corn stands throughout the county look remarkably well considering the conditions they were planted in and the weather we have experienced since planting. Each week throughout the growing season I will highlight and discuss the various corn growth stages. This week I will focus on the emergence VE & V1.
VE: Emergence – 115 – 120 Growing Degree Days (GDD’s)
Photo source: Iowa State University
Emergence occurs when the first internode on the corn plant (the mesocotyl) elongates toward the soil surface and continues until the coleoptile (or spike) reaches light, above the soil surface. At the VE stage, the growing point is normally 1 to 1.5 inches below the soil surface. The growing point remains below the soil surface for three to four weeks, protecting this growing point from physical injury, including frost, surface insects, grazing animals and as we have already seen in some parts of the county this year – HAIL.
Management: Scout for seed attacking pests: wireworm, white grub, seed corn maggot, seed corn beetle, slugs and varmints.
V1: Vegatative Stage 1 – 120 – 200 GDD’s
Photo source: Iowa State University
V1 usually occurs about 1 week after emergence. These plants have one leaf collar visible. The leaf has a rounded tip, all other leaves will be pointed. This leaf serves as the starting point for counting leaves to determining the vegetative growth stage. Nodal root development is beginning. The growing point remains below the soil surface.
Management: Scout for seed attacking pests: wireworm, white grub, seed corn maggot, seed corn beetle and slug, varmints, seedling diseases, and nutrient deficiencies.
Begin to look for early season weed emergence.
Begin taking stand counts to document emergence (measure 17.5 feet for 30 in. Rows)