Can anyone identify the powdery substance on my zucchini leaves?
by
Mary
+3
The older leaves seem to be affected but not the newer growth. And what can I do to eliminate this?
4 answers
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Hey there! It looks like a case of powdery mildew. The warm days and cool nights of late summer create an ideal climate for spore growth and dispersal of this mildew. If you garden traditionally, here's some information on how to treat it: http://www.ipm.ucdavis.edu/PMG/PESTNOTES/pn7406.html If you garden organically, here's some information from organicgardening.com: "To control minor infestations, pick off affected plant parts and either compost them in a hot compost pile or bag them tightly and put them in the trash. Powdery mildew can be controlled, but not cured." Also: "Research studies in 1999 and 2003 on infected zucchini and winter wheat (respectively) indicated that spraying cow's milk slowed the spread of the disease. To try this at home, mix 1 part milk with 9 parts water and spray the stems and tops of leaves with the solution. Reapply after rain. Spraying leaves with baking soda (1 teaspoon in 1 quart water) raises the pH, creating an inhospitable environment for powdery mildew."
Caitlin | Belong With Wildflowers
on Aug 14, 2014
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mildew grows on things where the air isn't circulating much.. the same thing can happen around crepe myrtle trees.. or any large leafy patches.. it just a little crowding .. might want to nip off those leaves or give them a wash with soapy water..
Rita Wozniak
on Aug 14, 2014
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Mildew ! Just spray it a with half milk and half water solution to get rid of...
Martha Magana
on Aug 14, 2014
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The time of day you water is important, and water the ground, not the leaves. Soaker hoses work best in Oklahoma
1di361646
on Oct 21, 2014
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