VT Corn Growth Stages and Scouting Tips
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VT Stage*
The VT stage arrives when the last branch of the tassel is completely visible. VT begins about 2 to 3 days before silk emergence. The plant is nearly at its full height. Pollen shed begins, lasting about 1 week on an individual plant basis and 1 to 2 weeks on a field basis. The interval between VT and R1 can fluctuate considerably depending on the hybrid and the environment. Drought stress lengthens this interval.
Tips*
GDUs Required** to reach VT depends on maturity and is approximately:
CRM | GDUs |
---|---|
80 | 920 |
90 | 1,075 |
100 | 1,175 |
110 | 1,280 |
120 | 1,420 |
Scout for these Common Pests and Diseases | Timing* |
---|---|
Corn Earworm | Arrival of adult moths from southern states varies each year. Corn at VT to R1 is most attractive to egg-laying females. Scout at R1 or when a significant moth flight is captured in pheromone traps. |
Corn Rootworm | Larval feeding is most extensive in early through mid-July in most regions of the Corn Belt. |
European Corn Borer | As the true stalk develops and European corn borer larvae increase in size, larvae can be found tunneling into the stalk. |
Eyespot | V6 through R4. Disease primarily found in northern environments. |
Goss's Wilt | VE through R6. Disease primarily found in Nebraska and portions of other western states. |
Gray Leaf Spot | VT through R4.** |
Japanese Beetle | VT through R1, until pollination is complete. |
Northern Leaf Blight | VT through R4.** |
Southern Leaf Blight | VT through R4.** |
Western Bean Cutworm | Initiate scouting based on local pheromone trap captures of adults. If trap data are unavailable, begin scouting at VT. |
* Information from Pioneer and Iowa State University Extension.
*** Scout for these diseases earlier in seed production fields.
Use this information as a guide and it should not be the only factor in making decisions.