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A22-Lancaster Fanning, Saturday, July 15, 2000
Potato Leafhopper Control
(Continued from Pago A2l)
as a sign of damage. The nymph
or immature stage is light yellow
and walks sideways.
According to a Penn State
handout, feeding by the insects
causes severe stunting of the
plants and yellowing or redden
ing of the foliage. Leafhopper
damage starts in wedge-shaped
areas at the tip of the leaf.
The first cutting of alfalfa is
not usually affected, but subse
quent cuttings can be severely
The offspring produced by the female leafhoppers, es
pecially the last two weeks before harvest, are “really
going to cause you trouble,” noted Art Hower at the field
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Typically the adults migrate
up from the Gulf Coast on storm
fronts, according to Hower. But
some can overwinter possibly
even as far north as Maryland.
Hall noted that leafhopper
damage can result in losses to
talling 500 pounds per acre per
cutting, in addition to reduced
New biological control meth
ods make use of glandular hairs
on the alfalfa which prevent the
leafhopper from feeding.
Hower spoke about the mor-
tality and entrapment of potato
leafhopper nymphs, compari
sons of leafhopper nymphs on
resistant and susceptible alfalfa
(with trichomes intact or re
moved), and eggs laid by the
leafhopper in resistant and sus
ceptible alfalfa with trichomes
intact and removed.
Breeding for these traits is dif
ficult, noted Hall. And produc
ers should remember that even
with 70 percent resistance, 30
percent have no resistance trait.
Hower said, “Could we
achieve 100 percent resistance? I
don’t know if we can do that, if
The Agri-specialists from
Farmers First aren’t a bunch of
deskbound bankers waiting
around for the phone to ring.
We get involved with you.
Right where you live and work.
We lend the money farmers
need to keep growing. And, we
can’help your business in a lot
of other ways, too. We talk the
talk. And we walk the walk
(wherever that might lead us).
How Much is PLH Resistance Worth to You?
(assuming four production years after establishment year)
Will you spray for PLH if scoudng indicates it is justified or if damage is visible?
Yes - continue to question #2
No - PLH resistance is worth additional costs
Do you determine when to spray based on scouting or when you see yellowing?
Yellowing - proceed to question #3
Scouting - proceed to question #4
How often do you see yellowing or does scouting indicate spraying is necessary?
Frequency Value (Alfalfa valued @ $l2O/ton)
2 per 1 yr - 240
1 per 1 yr - 120
1 per 2 yr - - 60
1 per 3 yr - 40
1 per 5 yr - 20
Based on either scouting or yellowing, how often do you spray to control PLH?
2 per 1 yr
-1 per 1 yr
-1 per 2 yr
-1 per 3 yr
-1 per 4 yr -
1 per 5 yr-
* value based $5/acre/year scouting charge and SlO/acre for each spraying
5. Determine value of PLH resistance.
Value from question #3
Value #5 / Seeding rate (Ib/acre) = Value ($/lb of seed) of PLH resistance trait on your farm.
we’ll ever see that.”
But if the producer doesn’t
want to spray, having resistant
varieties are worth it, said
John Ayers, Penn State crop
pathology specialist, said that
conditions could be just right for
stalk rot on com.
Stalk rot, a major stress dis
ease, is caused by early season
sunshine and lots of moisture.
But a sudden dry spell, a slight
moisture deficit, after these con
ditions can set it off.
The nutrients travel to the
kernels and weaken the plant.
(only if you answered yellowing to question #2)
ANDY TERRELL RONERB JAY HERSHEY
(717)626-4735 ( 717)768-7337 (717)768-8256
A SUSQUEHANNA BANC
Already Ayers has seen an
thracnose stalk rot, corn rust,
and northern corn leaf blight in
David Wagner, Penn State
precision ag specialist, spoke
about the importance of learn
ing spray calibration.
Spray drift liability is “be
coming a big cost factor in your
bottom line,” he said.
Wagner said it could be too
expensive, as a result of lawsuits
and insurance coverage, to not
place spray applications prop
2 per 1 yr
l per 1 yr -
-1 per 3 yr -
-1 pcrs yr-
*3* * ~T"
(Turn to Poflo A 23)