Posts Tagged ‘Problem Solvers’
Most Un-Wanted: Aphid
Sunday, June 27th, 2010
Wanted For: sucking the life out of innocent rose bushes with their needle-like mouth
Description: pinkish, greenish white; 1/16″ long & soft-bodied
Hangout: rose bushes; especially on stems, buds and young leaves
Kryptonite: Saf-t-Side Horticultural Oil, Bt & Lady Bugs
So Long, Suckers!
There are almost as many kinds of aphids as there are kinds of plants –rose aphid is just one example. Rose aphids prepare for next spring’s assault by laying hundreds of eggs on the branches of the rose bush. After the young aphids hatch, they spend their entire lives gorging on their victim’s life juices and producing more criminals. Too many on one bush can force some aphids to move and begin attacking another rose bush. Unless winters are mild, adults will die and only the eggs will survive until the next spring.
Not only should you learn about aphids, but you should also get to know the squadron of beneficial insects covering the area. Many hunt down aphids, restoring law and order.
However, aphids aren’t just sitting ducks-they have ants for bodyguards. Ants will tend aphids for their honeydew and protect them from aphid-eaters, so look for ways to deter ants, too.
Aphids reproduce quickly, actually giving birth to females that are already pregnant, so keep good records of changes in population size and tactics you used to control them.
CAUTION
aphids let diseases hitch a ride on their backs to new plants & then puncture plants for them so watch out for a fungus popping up at the same time as an aphid infestation
Planting for the future.
-By Maggie Oldfield Thayer Nursery
This Spring’s Most Un-Wanted: Winter Moth
Tuesday, April 6th, 2010
Wanted For: defoliating & weakening trees ultimately causing death after several years
Description: young are 1” green inchworms with white stripes on sides; adult males are grayish brown with 1″ wingspans and appear hairy; females have no wings
Hangout: ornamental trees (crabapples, cherries & birch), fruit and shade trees (oaks & maples)
Kryptonite: Horticultural Oil, Bt, Spinosad
Research from UMass Amherst is indicating that Winter Moth is expected to be in very large numbers this spring and the potential for defoliation this year might surpass last year. Begin peeling the buds open and start inspecting for the presence of tiny larvae, which wriggle into swelling buds to feed.
Horticultural oil spray should be applied now when temperatures are above 45°f. Hort oil is an organic control that works by suffocation. Eggs that are protectively hidden within crevices and under lichen will not be covered by the spray thus will not be killed.
Winter moth eggs hatch anytime between late March and early April. This is the time when the most damage occurs. There is great potential of injury when the buds stay swollen but unopened. Winter moths will enter both leaf and flower buds.
Once the buds open, the caterpillars are known as “free-feeders” given that they are now on the foliage and free to move easily from one area to another. Winter moth will be in this stage until late May or early June. While still on the plant, however, they are exposed and very treatable with Bt or Spinosad.
Bacillus thuringiensis, Bt, is a bacterium which must be ingested to be effective. Bt produces proteins that paralyze the digestive system of the winter moth. The infected insect stops feeding within hours thus starving to death in a couple of days. Bt works best on the younger stages of caterpillars; older ones are much less affected.
Spinosad is another organic control that is derived from a naturally occurring soil bacterium that was collected from soil in an abandoned rum distillery in the Caribbean by a scientist on vacation. Spinosad kills damaging insects by causing rapid excitation of the nervous system. Spinosad is fast acting – the insect dies within 1 to 2 days after ingesting. It works well as both a contact spray as well as by ingestion. Spinosad products work well on caterpillars of all ages.
The winter moth will then be out of sight until adults emerge in late November or early December when they are seen fluttering in your headlights or by your back door light.
-By Maggie Oldfield Thayer Nursery