10.5061/DRYAD.PNVX0K6K7
Leisso, Rachel
0000-0003-3808-3684
Montana State University
Anderson, Chase
Montana State University
Novak, Tracy
Montana State University
Mendrey, Katrina
Montana State University
Soller, Olivia
Montana State University
Miller, Zach
Montana State University
Montana surveys of codling moth damage to apple fruit 2019-2020
Dryad
dataset
2020
FOS: Agricultural sciences
Malus domestica
apple
Cydia pomonella
codling moth
Montana
Montana Department of Agriculture Specialty Crop Block Grant*
AM180100XXXXG047
Montana Department of Agriculture Specialty Crop Block Grant
AM180100XXXXG047
2020-10-09T00:00:00Z
2020-10-09T00:00:00Z
en
17229879 bytes
2
CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
Codling moth (Cydia pomonella) is the major insect pest of pome fruit
(apples and pears) in Montana. This dataset reports codling moth damage
to apple fruit ("strikes") in Montana orchards where site
managers were not applying pesticides to control codling moth. Data was
collected in August or September of 2019 and 2020. Certain sites east of
the continental divide have nominally lower incidence of codling moth
damage to fruit than sites west of the divide. Due differences in weather
year-to-year, we recommend continued monitoring.
Montana orchards where codling moth was not managed were surveyed for
damage to fruit in August and September of 2019 and 2020. Damage to fruit
was assessed by looking for exit holes left by codling moth larva. These
exit holes are termed "strikes" and are approximately 3 to 5 mm
in diameter, and often filled with frass (poop) to the point of
overflowing (see pictures). Personnel were instructed to count the number
of strikes in up to twenty fruit per tree, trying to include fruit from
all parts of the tree canopy. Where possible, twenty trees per site were
assessed, although some sites had fewer trees. Tree variety was recorded,
where known. Many of the sites are "heritage" sites, or remnant
orchards from the Montana apple boom around the early 1900s. Trees at
these sites tend to be large and assessing fruit from all parts of the
canopy is not safe, especially for personnel working alone. In addition,
varieties are not always known.
This dataset is a reference for a MSU Extension Bulletin titled
"Managing codling moth (Cydia pomonella) in Montana" (currently
in draft, 10/9/2020). Its purpose is to illustrate that codling moth is
either not present or causes less damage at some orchard sites in Montana,
as well as to provide access to raw data for personnel monitoring codling
moth in the future.