Midwest Tree Fruit Spray Guide - Iowa State University Extension ...

newly hatched nymphs fall to the ground and burrow
until they find suitable roots, usually 1 1 ⁄2 to 2 feet
beneath the soil. With their sucking mouthparts, they
immediately begin to suck juices from the roots.
During the spring of the 13th or 17th year, depending
on which brood is involved, the cicadas burrow upward
until they are about 1 inch below the soil surface.
When the proper night comes, they leave the ground in
large numbers and head for the nearest upright object,
preferably a tree. The nymph attaches itself firmly to this
object. By splitting its skin down the middle of the back,
it emerges as a winged adult. At first, the adults are soft
and white, but they become harder and darker as the
tissues dry. Mating takes place within a few weeks and
eggs are laid for the next brood.
There are 17 broods of the 17-year race (I–XVII) and
13 broods (XVIII–XXX) of the 13-year race. Each year,
somewhere in the United States, at least one of these
broods emerges. But any one brood will emerge only
once every 13 or 17 years. Contact your extension office
for information on broods and emergence in your area.
Females prefer oak, hickory, apple, peach, and pear trees
and grape vines for laying eggs. Damage occurs when
the females make slits in branches and twigs in which to
deposit the eggs. These small twigs and branches turn
brown and die, sometimes breaking off. The damage
may be severe in newly planted orchards or on new
plants of shade trees or shrubs. Heavy populations of
nymphs in the soil also may affect the growth and vigor
of certain trees.
You can prevent egg-laying damage by cicadas on
young fruit and ornamental trees by covering the
tree with a protective netting, such as cheesecloth.
Cover the tree and tie the netting to the trunk below
the lower branches. Remove the covering when egglaying
is over. If netting is not an option, you may apply
insecticides when egg-laying begins and repeat 7 to
10 days later. Pyrethroids are recommended to control
periodical cicada, but these applications may lead to
mite outbreaks.
Brown Marmorated Stink Bug
A new invasive species of stink bug, the brown marmorated
stink bug, is spreading across the Midwest from
the east. Where this species has become established, it
occurs in greater number and causes greater damage to
fruit crops than other stink bug species. Of the insecticides
listed on page 10 for the control of plant bugs
and stink bugs, Actara, Baythroid, Belay, Danitol,
Endosulfan, and Lannate have been effective against
this species in early trials in the eastern United States.
For information on the identification of this insect, see
http://www.ncipmc.org/alerts/stinkbug_alert.pdf. If you
suspect this insect is present in your orchard, contact
your state extension specialist in entomology.
MIDWEST FRUIT TREE SPRAY GUIDE
22
Miticides for Apple
The following miticides are registered for use on apples.
Refer to product label for registered uses, amount of use,
harvest restrictions, and remarks for use on other crops.
Brand Name
Rate
Per Acre
Days to
Harvest
MOA f
Group
“Superior oil” 2% before
pink
Acramite 50 WS 0.75–1 lb 7 UN
AgriMek 0.15 EC a 10 fl oz 28 6
Apollo 4 SC 4–8 fl oz 45 10A
Carzol 92 SP 1–1.25 lb by
petal fall
1A
Dicofol 4E 6 pt 7 UN
Envidor 2 SC 16–18 fl oz 7 23
Kanemite 15 SC 21–31 fl oz 14 20B
M-Pede b, c 1.2 gal ++
Nexter 75 WP d 4.4–10.67 oz 25 21
Onager 1 EC 12–24 oz 28 10A
Portal 0.4 EC 1–2 pt 14 21
Savey 50 DF 3 oz 28 10A
Summer oils b 1–2 gal ++
Vendex 50 W 1–2 lb 14 12B
Vydate L e 2–4 pt 14 1A
Zeal 72 WP 2–3 oz 14 10B
++ Apply before waxy bloom forms on fruit.
a Apply within 2 weeks after petal fall.
b Do not use with Captan, Sevin, or other sulfur-containing
products. Do not apply when temperatures exceed 90°F.
c Not very effective alone. Enhances efficacy of other
miticides.
d Allow at least 30 days between sequential applications.
e Vydate may cause fruit thinning if used within 30 days
of bloom.
f MOA is mode of action classification; for resistance
management, it is best to rotate to products from a
different group.