www.WalterReeves.com
About Walter  •  Contact Walter  •  Glossary
www.WalterReeves.com
Gardening in Georgia
   
Home
Lawns
Landscaping
Food Gardening
Houseplants
Insects / Animals
Tools / Chemicals
Gardening Events
How-To Archive
Seasonal Calendar
Q & A
Gardening Links

Walter on TV & Radio
Walter's Books

Buy Walter's Book Here!



 
Q&A Can't find your topic?

Rose Sawfly - Identification
Q: My Knockout roses are pretty hardy, but something is decimating them, right down to the veins. There are little green worms, maybe caterpillars? They are coiled into a C shape, and there are several on each branch.
A: You have rose sawflies. The leaf damage looks a bit like Japanese beetle feeding but if they were the culprit you’d see lots of them feeding on your roses.

Sawfly larvae are much more inconspicuous. The feed from the bottom of leaves and they are only out in early morning...so gardeners have a hard time seeing them. You’ve done a good job catching a picture.

The sawfly larvae LOOK like caterpillars to the uneducated eye but they are not. A sawfly is a primitive wasp-like insect. The females have a saw-like blade at the tip of the abdomen that is used to cut slits into plant tissue into which they deposit eggs. The resulting larvae feed voraciously. But since they are not caterpillars, they are not affected by the organic caterpillar insecticide, B.t. (Dipel, Caterpillar Attack, etc)

Organic insecticides such as insecticidal soap or those containing pyrethrin and canola oil are effective as long as you apply them under the leaves when the larvae are present.

The contact insecticide carbaryl (Sevin) offers good control if sprayed on the whole rose. Imidacloprid (Bayer Advanced Tree & Shrub Insecticide) is a systemic which can be applied to the soil around the roses in spring before feeding activity is noticed.

Read more here.









 

 



powered by
FreeFind

Find links, recipes and miscellaneous information Walter mentions on his WSB radio show, and check out Walter's schedule for TV appearances.

Click here to sign up for Walter's e-mail garden newsletter

Click here to check soil temperatures in your area.

Remove faded crape myrtle blooms and dry seed clusters now. With a little water and fertilizer, you may get more blooms in September.

View August Calendar


 
LawnsLandscapingFood GardeningHouseplantsInsects/AnimalsTools/ChemicalsCool Plants
How-To ArchiveSeasonal CalendarQ & AGardening LinksWalter on TV & RadioWalter's Books
About WalterContact WalterGlossaryFeedback
©2009 Walter Reeves The Georgia Gardener. All Rights Reserved.