Wednesday, September 7, 2011

IPD Who dun it?

On the late planted grain sorghum we found that there were many different feeding patterns shown on the leaves.

The first was a random slothole pattern which probably occurred before the leaves had fully unfurled and other edge feeding, the edge feeding could be explained as late feeding by something like a caterpillar or grasshoppers and then wind damage that may have happened after the fact. Very few live insects were found on this sample.

Along the stem next to the leave sheath, there was some frass left over from fly larvae that was observed feeding when we dissected the plant.

Some windowpaning was seen at some places along outside leaves. Which would have been caused by another insect with smaller chewing mouthparts.


With the late planted soybean samples there was windowpaning observed on some of the leaves. A caterpillar was observed on the plant.

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There was also a possible disease present that was causing leaf chlorosis to appear.

The early planted sorghum showed that there was some circumstantial head feeding occurring, it was difficult to see without peeling back the panicles of the seedhead. It was evident that yield loss had already taken place.

There was also some insignificant mucous observed around a leaf collar.

In the sunflower plant it was evident that there was circumstantial feeding that had taken place on the leaves.

There was no damage seen to the head of our plant but it was stunted and this could be attributed to compacted soil, since the roots looked like they were not allowed to grow very deep.

The plant that we cut open showed now damage to the stem but in another group there was a stem boring caterpillar that had caused some damage.



The corn plant showed circumstantial evidence of an ear borer worm, and some ear mold.



There was also a caterpillar observed as direct evidence of some leaf feeding.

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