"Lotus leaves being fed on by moth larvae"

Asked August 18, 2016, 10:20 AM EDT

I have a fresh water pond that has Water Lilly's and Lotus growing in it. Last week I noticed that the Lotus leaves had fleshy brown and green Lepidopteran larvae feeding on them causing a highly visible skeletonizing symptom that is getting worse as the areas coalesce. From my research it looks like I have a worm known as China mark Moth. The area involved is quite large covering about a third of the pond. Can I treat with a sprayer mixed with Bt kurstaki or Conserve (Spinosad)? There are fresh water fish, frogs and turtles in the pond so I'm not sure if I have any treatment options.

New Castle County Delaware

2 Responses

We can not make any pesticide recommendations outside of Maryland and suggest that you contact your local county Cooperative Extension office.
Here is that contact information:
New Castle County Office
461 Wyoming Road
Newark, DE 19716
Phone: (302) 831-2667
FAX: (302) 831-8934

This is one of our older publications regarding your problem, but again, you should contact your local Extension agents for best management: https://extension.umd.edu/sites/default/files/_docs/programs/ipmnet/FS818-ControllingTwoAquaticPlant...

cm

Many thanks, that's a great article with a lot of useful information.