1. Q: My wife keeps three very large water gardens, and in them she has lots of lillys and lotus. She has some parasite eating the lilly leaves. It is about 2mm in size, white, and attatches to the bottome of the leaves. Do you know what it is and what we could do about it? We do keep koi and goldfish in the pond, so we worry about toxicity to the fish for any cure.

A: I think the problem you are having is small insect larvae eating the waterlily foliage. Water lilies have very few pests. Listed among their worst enemies are ducks, geese, swans, deer, fish (more than 10 inches long) and turtles. Leaf-eating worms (caterpillars) should be controlled by applying a Bacillus thuringiensis (Bt) product (Dipel, Biotrol, Bio Worm Killer, Thuricide) weekly. Bt will not harm fish.

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