Check For Mites
(Continued from Page E 9)
mouthpart into the cell and draws out
the cell contents, leaving a shrunken
cell. It then moves to another cell and
continues feeding. Very rapidly, the
plant displays a “rolled” characteristic
that is very similar to drought stress.
The tip-off to an infestation is the
droughty symptom in April or May
when adequate soil moisture is avail
able.
Severe mite infestations have two
negative impacts. Severe feeding
causes substantial yield losses. Yield
loss estimates range from 30 to 70 per
cent. Severe feeding has resulted in
stressed stands that are not able to
withstand extreme summer growing
conditions, especially droughts and
high temperatures. A second impact of
the mite is related to forage quality.
Under high mite pressures, the hay
cures with a brownish discoloration.
This off-color makes horse producers
reluctant to pay top dollar.
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Over 750 individual
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Research is continuing into alterna
tive control methods. There is some
thinking that extremely low cutting in
late fall discourages population build
ups during the winter. Initial results
do not show any advantage to clipping
timothy in the fall for mite control.
Investigation studies into possible
timothy variety resistance were also es
tablished in Maryland and Pennsylva
nia. Results from one year of data col
lection showed no variety preference
or rejection by the mites. All varieties
were affected by the mites. For more
information check out the web sight:
HYPERLINK “http://
www.ento.psu.edu/extension/
factsheets/cerealrust.html”
www.ento.psu.edu/extension/
factsheets/cerealrust.html.
Controls
There are no “natural” enemies of
this pest, primarily due to the fact that
it develops during winter and is dor
mant during the summer. A supple
mental label use, called a “24 <9 ” was
granted for Pennsylvania timothy pro
ducers to use Sevin XLR as a tempo-
Trial proven varieties & mixes:
#1 at Cornell
#2 at Penn State
9. Spring Green
Festulolium-
The highest digestible fiber (dNDF) out
of 35 varieties, Ist cut 2002.
IQ.Pizza Orchardgrass-
Nearly 6% higher digestible fiber than
Baridana, and 400# more milk/ton than
Pennlate.
11. Glacier Timothy-
The highest yielding at Cornell, 1.3 tons
more DM than Climax. 8-10 days earlier
and 3% higher dNDF than Climax.
12.D8 HavMaster Mix-
The highest yield and 3rd
out of 35 for lbs. milk/A. Brand Forage Products
13.:
imik
#1 out of 35 for 6 hr. & 30 hr, fiber
digestibility, #.2 lbs. milk/A after 5 cuts.
14. AU-Weather Mix-
#1 in lbs. of milk/A out of 35 after 2 years
of testing.
Lancaster Farming, Saturday, April 19, 2003, Foraging Around-E27
rary solution for the cereal rust mite in
2001. Label directions call for the use
of two to three pints per acre of Sevin
XLR with adequate carrier for com
plete coverage of the timothy, a min
imum of 20 gallons/acre (25 gal./acre is
preferred).
Treatment is recommended approx
imately three to four weeks after
green-up to fields with a past history
of mite infestation or when 25 percent
of plant tillers exhibit curled tips. Ap
plication is restricted to one time per
cutting and must be made at least 30
days prior to harvest.
Follow all application directions and
safety requirements. Many growers
have included broadleaf herbicides
and nitrogen fertilizer in their applica
tions. Be sure not to apply too much
nitrogen or too little carrier. Stick with
25 gallons/acre of a carrier of water
and liquid N.
Note that Sevin controls the mite by
coming into contact with these small
critters. This is the reason that high
rates of carrier are needed for opti
mum control.
Shown is a stand of good
timothy exhibiting no infesta
tions of mites, as evidenced by
the leaves being open in ap
pearance.
Tuesday, April 22
*
Pastured Poultry Workshop, Benton Center,
N.Y., Town Hall, 9:15-3 p.m. (315)
536-5123.
Wednesday, April 23
Pasture Walk, St. Brigid’s Farm, Kennedy
ville, Md. 10:30 a.m. -1:30 p.m. (301)
631-3576 or (717) 687-6224.
Wednesday, May 7
Pennsylvania Project Grass Youth Grass
land Evaluation Contest, Rocksprings
(724) 834-3970.
Thursday, May 8
Pasture Walk, Green Meadows Farm, Bird-
In-Hand (717) 394-6851,
Wednesday, May 28
Pasture Walk, Garber Dairy Farm, Eliza
bethtown (717) 394-6851.
Thursday, June 19
Pasture Walk, Arden Landis Farm, Kirk
wood (717) 394-6851,
Thursday, July 1 7
Pasture Walk, John S. Glick Farm, Marietta
(717) 394-6851.
Lancaster Farming
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