September 2022 - 15

POSTHARVEST
near harvest as a ground
application reduce speck rot
caused by P. washingtonensis.
Good coverage is important to
the effectiveness of preharvest
fungicide sprays. A postharvest
fungicide drench with Penbotec
(pyrimethanil), Scholar
(fludioxonil) is highly effective in
controlling this disease on apple
fruit. A postharvest drench with
Mertect (thiabendazole) is also
effective. These three postharvest
fungicide treatments are more
effective than the preharvest
fungicide sprays.
- Chang-Lin Xiao, USDA-ARS,
San Joaquin Valley Agricultural
Sciences Center, Parlier, California.
Prepared by W. E. Jones, WSU,
Tree Fruit Research and Extension
Center, Wenatchee, Washington.
Developed for the Northwest
Fruit Exporters and Northwest
Horticultural Council.
Disclaimer: Mention of trade
names or commercial products
in this article is solely for the
purpose of providing specific
information and does not imply
recommendations or endorsement
by the U.S. Department of
Agriculture or Washington State
University. FGN
Close-up of an infected 'Manchurian' branch. Yellow arrow indicates the spread of
pycnidia (fruiting bodies); Blue arrows show the boundaries of a canker. Pruning
should eliminate the entire infected region. Photo: R. Kim, Pace International
Stem-end rot on Red Delicious.
Photo: C-L Xiao
Calyx-end rot on Red Delicious.
Photo: C-L Xiao
'Manchurian' crabapple tree showing
signs of twig dieback (white arrows),
canker (between blue arrows), and black
fruiting bodies (between yellow arrows).
Photo: R. Kim, Pace International.
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FGN | SEPTEMBER 2022 | 15

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September 2022

Table of Contents for the Digital Edition of September 2022

September 2022 - 1
September 2022 - 2
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