To Mary and Mike,
These are pictures sent to me yesterday after phone conversations with both the producer, his neighbor and the CEA-Victoria. This doesnt' look like Command damage, but more like gylphosate drift. The fact that the tops are so white puzzles me, but perhaps the cool, cloudy weather has delayed it turning brown. Any ideas, or can you confirm this as glyphosate or some other herbicide?
Steve
Look at the pictures of suspected Round-Up drift injury.
| Field Rows | Close Up |
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Two images of a corn field showing rows with a dead (treated) area in the background. And two images showing close-ups of corn plants showing the type of injury that was observed.
We have seen similar corn injury in the Brazos Valley in the past. There was an aerial application of Round-Up to acres of land being prepared to plant cotton. Round-Up was used to kill the existing weeds in the field and injury similar to what your images show was seen. I am sorry I do not have photos of that damage but I tried to simulate the injury by applying low levels of Round-Up to young corn plants. and here is what I saw.
Here is what I saw.
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Compare 35.5, 17.7, and 8.9 grams per hectare
Compare 17.7, and 71 grams per hectare
Compare 17.7, and 8.9 grams per hectare
Plant injury 17.7 grams per hectare - close
Full plant 17.7 grams per hectare - no sign
Full plant 17.7 grams per hectare
If we were treating at 1 pound per acre, that would be about 1 quart on an acre.
When 17.7 grams per hectare is applied, that is like about 2 teaspoons per acre.
References related to Roundup Injury:
A. What does Roundup/Touchdown injury look like?
A. Purple Corn May Indicate Herbicide Injury.
B. How does Roundup "purpling" differ from P deficiency?
C. Malformed soybean leaves.
D. Roundup drift injury on corn (closeup).
A.
Factors influencing drift potential with glyphosate.