—Lancaster Farming, Saturday, July 6,1974
14
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DiscoVEßY'Of a way tp disrupt male
female communication links may
lead to a new biological control
method against two insect pests.
In the past, sex attractants have been
identified and produced synthetically
for several species. Researchers say
these synthetic attractants could be
employed in two basic ways—to trap
the-insects, mainly for survey purposes
in integrated control programs, or to
disrupt normal sexual behavior of the
insects. Both methods of employing
synthetic attractants Have been studied
extensively by entomologists and chem
ists throughout the world.
Now, a team of ARS and lowa Agri-,
Mill Proibction
Why not Try
HOOBER'SC
16% Texfured Dairy Feed
with JET EXPLODED CORN
Or
16% Pelleted Dairy Feed
also
Ask about our corn
exchange program.
JOHN J. HOOBER,
Inc.
Gordonvilie, Pa.
768-8481 or 768-3216
MANUFACTURER OF COMPLETE LINE
OF DAIRY, SWINE &*POULTRY FEEDS
•Jl-sr
Ibughest Bam Clea
Badger Barn Cleaners are built to pro-
Rugged Chain vide more years of dependable, trouble
. . free service Cham has torged. hardened
And Transmission links with heavy flat bar connectors No
Mioi#a it Hnra hooks to straighten, come unhooked, or
IViane n more sna g Heavy duty transmission with V
nonanrlahia belt drive features a one-piece cast
uepeiiuaoie f rame a nd rugged drive gear built to last
a lifetime. Husky box beam elevator is
leak proof and a full 12-mches deep
Whether you’re thinking of replacing
chain or installing a completely new
_____ system, see your Badger dealer
BodgeHtealef «RU. SHIRK SHOW-EASE STAII
- Lebanon, Pa 523 Willow Rd.
PH 867-3741 UnMSter^Pa.
GRUM ELM'S FARM
LLOYD E. KREIDER SERVICE WAAC W. HURST
R. 0.81 Mechanics Grove
Cochranville, Pa Quarryville, Pa. ast Earl, Pa.
Ph. (2151 932-2934 Ph. 786-7318 Ph- 1215] 445-5767
Jamming Insect Communication Systems
culture and Home Economics Experi
ment Station scientists at Ankeny, led
by ARS entomologist Jerome A. Klun,
has scored a breakthrough in under
standing the'sexual-chemical systems
of the European corn borer and red
banded leaf roller moth. Females of
both species emit a chemical, 11-tetra
decenyl acetate, to attract their mates
(AGR. RES., Feb. 1970, p. 7). This
compound exists in two geometric
forms, or isomers, designated Z (cis)
COURTHOUSE SQUARES
f WHAT IS PAST I
\ IS PROLOGUE, \
I IM COURTHOUSE }_
LINGO MEANS,
) "YOU AIN'T SEEN
( NOTHIN' YET/ "
Dandelion Salad
Wash enough dandelions for
four persons. Put salad in a
bowl and add two chopped,
hard-boiled eggs. In a skillet,
fry Vi-pound of minced bacon.
When done, take the skillet
from the fire and add to it Va
mp of wine vinegar and quickly
pour over salad. Season with
black pepper and salt. Add
fresh watercress for an extra
taste sensation.
Wien picking dandelions for
these dishes, the staff at Mer
cury suggests you look for new
ly sprouted plants. Older dande
lions have a tendency to become
slightly bitter.
Boating safety should
begin in the driveway for the
-owners of the nation’s three
and half million trailered
boats. Check tire pressures,
hitches and bearings to avoid
a boating accident on the
highway.
lerYbi
and'E (trans). The Ankeny research
team has found that a mixture of the
two isomers attracts, the'insects much
more'effectively than do pure isomers.
Researchers found that males of the
lowa strain of European corn borers
respond best to a mixture of isomers
containing 96 parts Z and 4 parts E
(96:4 Z/E ratio). On the other hand,
male redbanded leaf rollers are most
attracted to a 92 : 8 ratio.
Dr. Klun said the research indicates
that although females of both species
use the same chemical to attract their
mates, the difference in the Z/E ratios
naturally minimizes the possibility of
a male pursing a female of the wrong 1
species even though the mating flights ''
of the two species occur concurrently.
In field tests, the researchers dis
rupted the male-female communication
link by distributing synthetically pro-
duced E isomer. Males were not at
tracted to the scent of their potential
mates because the proportions of the Z
and E isomers in the treated area were
altered.
Observing the success of the experi- proportions of attractants. This could
ments, Dr. Klun said, “The use of this advance knowledge of the chemical
disruptive technique to reduce mating ' communication systems of insects, and
by insects may be an easier method to perhaps bring the day closer when their
implement than has been thought.” sex attractants will be useful in suj£.
Further knowledge is needed, however, pressing insect pests.
Atlantic Genetic Power Profit-Maker Sires I
15H123 WHITTIER FARMS APOLLO ROCKET
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f
to find the best meins of* dispensing
the isomer and min imizingany-possible
detrimental environmentaliffects.
In the past, the significance of minor
amounts of the E isomer mixed with the >
Z isomer was not realized, Dr. Klun
said, because of the nature of bioassays
and chemical methods routinely used
in investigations of insect sex attract
ants. Moreover, in laboratory synthesis
of the Z isomer, a pure product is not
obtained.
Dr. Klun pointed out that other
species of moths may also possess the
dlefactory apparatus that permits de
tection* of small variations in the
geometric composition of sex attract*
ants. In only a few studies of sex at
tractants'tof insects in the Lepidoptera
order, Dr. Klun said, have the exact
geometric compositions of the synthet
ic attractants been reported.
, In view of the recent findings, he sug
. gested that previous research should be
re-evaluated and future studies should
routinely include an investigation of
insect response to varying geometrical
- '
' c