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Entry Date
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Nick Name
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Location
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Friday, August 23, 2019
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Matt D.
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Connecticut
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Entry 172 of 210 |
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CYVD (Cucurbit Yellow Vine Decline) Leaf Comparison
This images shows a clear comparison between an infected leaf (on right) compared to a normal leaf (on left). When identified early there can be this great difference visually between adjacent leaves before it runs down the vine.
CYVD is caused by a bacteria (Serratia marcescens) which is stated to be vectored by the squash bug (Anasa tristis) which I agree with. However, due to the wide spread of the disease and the seemingly fast speed of travel I am finding it hard to believe this disease is only spread by this squash bug.
This bacteria proliferates in the phloem of the plant (tissue responsible for sugar transport, unlike Fusarium which is mainly found in the water conducting tissue called the xylem). The reason I mention this is aphids are phloem feeders and while they may not currently be connected to CYVD, they do feed on the same conductive tissue the bacteria is known to reside. In contrast, cucumber beetles are known to be carries of bacterial wilt, but this is typically found in the xylem tissue.
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