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Iowa

I have concluded that my problem is possibly aphids. With timely applications of Baythroid, insects were the last things I was looking for. I figure all the rain we got must have broken down the Baythroid faster than normal and let them take over. And it probably didn't help that I mowed my cover crop of soybeans on my alternate patch. Hopefully I can somewhat save what is left of the plant. Thanks to all that helped, especially Steve who led me in the right direction.
Ralph

Here is the link again for all those who may want to see what the early signs look like

http://www.bigpumpkins.com/Diary/DiaryViewOne.asp?eid=73559

9/4/2007 10:25:10 PM

Mill Bay, British Columbia

Sure does not look like aphid damage to me...aphids would be on the underside of the leaves and just sucking up the juices.

Looks more like a fungal disease or leaf burn from something you applied.

9/5/2007 12:31:14 AM

Iowa

Well I could be wrong, but I am seeing lots of aphids and they seem to be congregated in the places where the yellowing and brown spots show up later. Unless they are just a vector for some type of disease. I will see, sprayed last night.

9/5/2007 10:04:22 AM

Ctpumpkin@optonline.net

That leaf damage is most accurately described as "necrosis". The CAUSE might no longer be present to reveal itself. That's why I do what I do for a living. Even the best plants people overlook "cause & effect" once in a while. So the good pathologist/agronomist is really just a good detective. One has to be intimately familiar with the local weather to look at necrotic leaves & call the reason.

Aphid damage could look like this under some conditions but spray events & weather at the time would also influence the appearance of the symptoms.

9/5/2007 11:52:48 AM

Anamosa, IA BPIowegian@aol.com

I hope you solved the problem. I know there have been a lot of aphid problems in soybeans around here this year. If you mowed their food supply they probably moved to the next closest crop to feed on. I do like the idea of planting soybeans when rotating patches. I have used them that way myself.

9/5/2007 1:36:24 PM