burr knots

Listing 1 - 4 from 4 for burr knots

Dogwood Borer
... near burr knots. Trees that are already infested and that have large numbers of burr knots are particularly attractive. The larvae hatch after eight to nine days and seek entry into the plant. The burr knots ... feeding of the larvae. NAA applied to the burr knots will destroy the knots but will not discourage attack by the dogwood borer. Killing the burr knot tissue with NAA is not desirable because ...
www.canr.msu.edu

Fire Blight Symptoms
... we were able to tell without cutting the trunk which trees had rootstock blight. Burr Knots and Fire Blight Burr knots form on many dwarfing apple rootstocks. Burrknots are formed from root initials that ... swelling forms and this is called a bur knot. Burr knots are attractive to Dogwood Borers. These insects will lay their eggs near burr knots and the larvae will bore into the trunk. This ...
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Fruit Pathology - Disease Diagnostic Key
... area, CROWN GALL (Agrobacterium tumefaciens) (Ohio State University) 2b. Small green, corky, elongated outgrowths (knots) on limbs. Knots turning black and woody after one season. Common on plum, occasionally found on sweet ... These keys are modifications of those presented originally by M. R. Schwarz and T. J. Burr, 1984, New York's Food and Life Sciences Bulletin Number 108, Diagnostic Keys for ...
www.caf.wvu.edu

ECSONG: The Nuttery: 19(2) 2000
... trunks for at least a decade before falling off, so there are numerous deep open knots and cavities. Most dead branches within reach were removed last Fall Field Day, but it ... species. I have a larger tree, which has a deeply indented leaf, not unlike the Burr Oak leaf we saw in the presentation on Bur Oak last spring. It may be ...
www.ecsong.org