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| We sprayed Veltyma for Tar Spot August 13th. A week later I was the first to find southern rust here in Saint Croix County WI. The Veltyma label recommends spraying every 14 days when there is disease pressure so we applied Headline fungicide August 27th. The weather then turned really cool which slowed the rust. Lately it has been very warm and it seems a lot of bad stuff is kicking into high gear.
1. You can walk a long way through our fields before finding ONE tar spot. The unsprayed neighbor's corn is full of it to the top leaf.
2. All the area corn apparently has anthracnose starting at the top and then moving down. Some is dead and most of it will be by the end of the week. Our corn leaves above the ear are still dark green, the lower ones are dying in some spots.
3. Areas of our corn that were not sprayed have way more southern rust and other "stuff." A lot of corn in the area has the ears tipping down. The husks in our fields are turning white and we have a few tipped down ears. If that is what happens to our corn the game is over. I think it will hang on a week or two yet and it should be ok.
4. We have never had southern rust before but if I could do anything over it would not be the timing of application. We may have used a different product for the initial pass but the Veltyma did pretty good all things considered.
5. I found a cob that was narrow in the center (arrested ear development) on a short and late germinating corn plant that probably got Veltyma on it while pollinating.
6. If we had sprayed at pollination there would have been no payback. There was no disease pressure until August 20th.
7. In my opinion you need to spray fungicide a week before disease hits. Not so easy to figure out! | |
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One fungicide pass was not enough
