|Leafrollers - (many species)
- Missoula County Extension
Atthowe - Missoula County Extension
are ½ inch tan moths; larvae are 1/4 to 3/4 inch, green
caterpillars with a dark head. There is one generation per year.
||Apple, pear, plum, cherry, raspberry, currant, ash, boxelder, elm, linden, poplar, willow, locust, rose, and oak.
are 1/2 to 3/4 inch moths with a mottled, rusty-brown pattern; larvae
are 1/4 to 3/4 inch, pale-green caterpillars with a black head. There
is one generation per year.
trees and ornamental trees and shrubs.
are 3/4 to 1 inch moths with a tan to brown band; larvae are 1/4 - 1
inch, green caterpillars with brown heads. There are two generations
CYCLE: Our main Montana leafroller, the Fruittree
leafroller overwinters as an egg. Eggs hatch into tiny larvae in
spring around mid-May. Larvae feed on leaves for about 30 days
and then pupate in a rolled leaf or similar
shelter. Eight to 11 days later the adult emerges from the pupa. The
moths live only about a week, during which time they mate and lay eggs.
They fly in May or June for about 3 weeks. Only one generation occurs each
Chemical: Spinosad - Treat by spraying newly hatched larvae.
Biological: Several native
parasitic insects have
provided adequate control of Oblique-banded leafrollers in Wisconsin,
including a species of tachinid fly and species of braconid,
ichneumonid, and chalid wasps. Spiders, pathogens, and other predators
also contributed to oblique-banded leafroller control in a University
of Wisconsin study.
Botanical: Bacillus thuringiensis (Bt-K).
Treat newly hatched larvae, before leaves curl. This works best whentemperatures are warm (>50ºF). See Bacillus thuringiensis.