Entering through the bud scale
margins, they do serious damage to maples, oaks, apples, cherries, basswood, crabapple, ash, and blueberry.
The bud scale
is a tiny leaf-like structure that covers the bud and protects it.
We estimated length of leaders of current annual growth for feltleaf willow from their diameter at the bud scale scar using regression equations developed for this crushed area by Bowyer et al.
In that analysis, diameter of current annual growth was the dependent variable, with location on the twig (at the bud scale scar or bite) where diameter was measured, previous browsing history (browsed or unbrowsed), and their interaction as main effects.
Budbreak was regarded when a green tinge was seen beneath the bud scales
; this evaluation was performed weekly.
Persistent feeding by large numbers of mites results in reddening and swelling of the base of the bud scales. Buds appear rosetted, are delayed in their development, and often fail to open.
The number of mites per bud was determined by dissecting the stained buds and counting individual mites of all life stages (excluding the eggs) on the inside of the bud scales with the aid of a dissecting microscope at X63.
The adults emerge in the autumn and lay eggs under the bud scales
. The eggs hatch in the spring and the larvae infect the growing twig.
You can then repeat this next February but there is a major warning - do not spray if we have a mild winter and the buds begin to enlarge as the Armillatox can get into the bud scales
. It acts as a total sterilant and is very effective.
Shrubs 2-4 m tall with branches in whorls; branchlets in 3's or subopposite or alternate, dark-brown to yellow-green; buds ovoid, 2 mm long, yellow-brown, the bud scales persistent, ovate to triangular-lanceolate, keeled, 1-1.5 x 1 mm, yellow-brown to gray-brown.
Presence or absence of papillae on the lower surface of the leaves and variability in the persistence of the bud scales are two other features that have been used with limited success in the analyses of taxa in Southeast Asia (Cheng et al., 1978; Ferguson, 1978; Hu, 1964).
Peach leaf curl is caused by a fungus (Taphrina deformans); rainwater-spread spores enter and infect leaf buds as the bud scales
separate and expose the leaf tips.