Biology Reference
In-Depth Information
Growth starts in spring earlier than on normal
trees. Production gradually decreases, with trees
worthless in a few years. Transmission is by root
grafting and sharpshooter leafhoppers. Control
has been by eradication and by quarantine to
restrict movement of nursery stock.
Peach Wart
Foliage is normal but fruits are blistered,
welted, and have conspicuous raised warty out-
growths. Tissues are light tan to red, rough,
cracked, and russeted or smooth, with
severe gumming. Transmission by budding or
inarching.
Peach Red Suture
Probably a form of yellows. On peach and
Japanese plum. Fruit ripens prematurely with
softening, swelling, and red blotching on the
suture, flesh coarse and watery while rest of
fruit is hard and green. Eradicate diseased trees;
propagate from healthy budwood.
Peach Yellow Bud
¼
Tomato Ringspot
Nepovirus
Winter's Peach Mosaic. On peach, apricot and
almond in California. Pale yellow, feather-edged
blotches along the midvein with leaf distortion,
and defoliation near base of shoots. Transmission
is by grafting. In field spread is only to adjacent
trees, perhaps through soil.
Peach Ring Spot Ilarvirus
Cherry Ring Spot.
▶
Peanut Mottle Potyvirus
Peach Rosette
On wild peanut (
Arachis chacoense
).
On peach and plum. Trees suddenly wilt and die,
or there are abnormally short stems bearing
dwarfed leaves, with veins cleared and thickened;
death follows in a few months. The virus can be
inactivated by heating at 122
F for 10 min.
Peanut Stunt Cucumovirus
First noted on peanuts in Virginia in 1964 and
also occurs in bean, red and white clover. Severe
dwarfing and malformation of foliar parts and
suppression of fruit development. Transmission
by grafting and green peach aphid.
Peach Rosette Mosaic Nepovirus
Of minor importance on peach, highbush blue-
berry, and plum. Delayed foliation, chlorotic
mottling, rosetting of shoots, dark green color;
transmission by grafting and through soil. Eradi-
cate trees; do not replant in same soil without
fumigation.
Peanut Top Paralysis Potyvirus
Found in Oklahoma but there is no evidence of
spread.
Peach Stubby Twig
Pear Decline Phytoplasma
A new disease of peach and nectarine in
California. Chlorotic leaves, stubby twig growth,
decreased fruit production;
A relatively new and devastating disease in
California, Oregon, and Washington, trees
showing a slow decline or rapid collapse. First
thought due to a toxin of
transmitted with
infected budwood.
the pear psylla
