Rhode
Island Apple IPM June 11, 2010 I only made it to one orchard this week – and it looked good! We are at the time when spores of summer diseases, fly speck and sooty blotch, start coming into the orchard from adjacent woods and hedgerows such as trees, shrubs, vines, and particularly wild brambles. Captan can be used alone for 2 weeks of protect ion or mixed with Topsin-M to give you 3 weeks of protection. The strobies, Flint, Sovran and Pristin, also protect well against summer diseases. Remember there are limits to the amount of Topsin-M and strobies that can be applied in one season. Topsin-M is limited to 64 ounces per acre per year; the strobies are limited together to 4 applications per season and no more than 2 in a row. Plan to have your final spray before harvest contain either a strobie or Topsin-M. I just learned today that rather than mix captan with Topsin-M, you can also mix captan with a phosphate fungicide such as Prophyte. This combination seems to be as effective as captan plus Topsin-M. I am a bit concerned about obliquebanded leafroller. Last year we found
obliquebanded leafroller in 2 orchards in August. The concern is that
we could have leafroller populations that are resistant to commonly used
insecticides. New York has had resistant populations of OBLR for decades,
and western Mass started a few years ago. The orchard I was in today
was one of the two orchards where we found OBLR last year. We did not
find any newly hatched larvae today. Look for tiny caterpillars on terminal
leaves or chewing on skins of apples that are bunched together. Insecticides
to control OBLR include Delegate, Altacor, Intrepid, Proclaim, Rimon
and Dipel.
|