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Posted by whitecap2 8b (My Page) on
Tue, May 8, 12 at 11:31

Having perused the results of a search here on leafrollers, I'm left with the impression that orthene / acephate is the most effective control, followed by BT. I've found a Bonide product, Systemic Insect Control, a concentrate containing 9.4% acephate. Is this what I need? The only leafroller listed in the product use guide is "oblique banded leafrollers," which may not be the ones I need to be concerned about. The guide also doesn't list canna as an appropriate plant for use of the product.

Anyone have any idea how long it takes this stuff to become effective, or whether overtreatment can damage a plant?

Follow-Up Postings:

RE: Leafrollers

Acephate has been the most effective liquid "systemic" control of the lesser canna leaf roller I have found and used for many years. I have tried many other products. Once the chemical dries on the foliage, it is absorbed and distributed to the growing plant. I prefer to spray late in the day when bees and other beneficial insects are less active. Do not apply near fish ponds etc. Stay out of the damp foliage until it dries. Effectiveness duration depends on growth rate and temperature. In most areas, reapplication may be needed every two to three weeks.
Because the lesser canna leaf roller is not exposed directly to a typical dust or spray, a systemic control is the most useful. BT may work fine for the greater canna leaf roller because if openly feeds on exposed leaves but it does require frequent application. It seldom reaches the lesser leaf roller.
I have never seen phytotoxic injury from acephate on cannas. I am not familiar with the product brand listed so please read and follow instructions carefully.


RE: Leafrollers

"Lesser canna leaf roller," that's the one, thanks.

RE: Leafrollers

Kent, do you add a surfactant to your spray? Maybe a mild dish soap? How much? Thanks, Lou

RE: Leafrollers

I have always used a surfactant (wetting agent) with acephate. Of course I have/had access to commercial surfactants but you are correct in suggesting a mild soap. As I recall, others have use liquid Ivory soap. I think you might try about a tablespoon to a gallon. There should be a slight sudsing action but not like washing dishes!! Kent

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