|powdery mildew on yellow crookneck squash leaf|
powdery mildew compromises a leaf's ability to photosynthesize and eventually completely destroys the leaf. if enough leaves on a plant are affected fruit production declines or stops and the whole plant can even die.
things were looking pretty bad for a while...
i did use the "wait and see" method for a while. i like to let things resolve on their own if possible. it became clear pretty quickly that the mildew was moving faster than the plants could handle and i'd have to do something.
|getting ready to spray|
i think i would have moved a bit faster with my intervention if i had noticed the outbreak at the very beginning---many of the squash plants have what's called silvering on their leaves, a natural silver pattern on the upper side of the leaf, which can make it difficult to spot powdery mildew in it's earliest stages because the two are pretty much the same color.
|healthy squash leaf showing silvering|
things are starting to look pretty good again.
the yellow blotches on the leaf pictured below are areas where powdery mildew was growing but has been killed by the foliar sprays. interesting to see how the mildew sort of bleaches out the chlorophyll.
there's still some mildew here and there but overall it seems to be quite manageable at this point.
|squash plant getting happy again|