P AGRICULTURAL RESEARCH CENTER
Mimeo Report BB 1972-4 August 16, 1972
EFFECTIVENESS OF EIGHT INSECTICI SLjUME LIi'(A ,Y
AGAINST THE CATFACING INSECTS OF PE l
Sam S. Fluker ,. i Q7
The catfacing insect complex is a potentially serious il.A6S .fLAcH0 FIorida
in Florida every year. Even with the vast amount of effoLL uAepan~ud by
the growers each year to control the catfacing insects, there is still
considerable losses occurring due to the presence of the catfacing insects.
For the above reason, this experiment was conducted in an effort to im-
prove the chemical control of these insects.
For this test, 336 peach trees of the Rio Grande variety were selected.
The trees were 5 years old and in their third fruiting season. They are
located at the Peaches of Florida Orchard in Madison County, Florida.
The orchard is now and has always been maintained as a commercial peach
B The trees in this test were sprayed using a Sold Model 423, Mist-
blower. The insecticides and fungicides used were mixed for a 24X con-
centration. The mistblower was calibrated to deliver approximately
16 fl. oz./30 seconds. Each tree received 16 oz. of formulated material,
during each ap location. All test trees, except those receiving Thiodar-
2-M and Pencap M-2 at short intervals, received insecticide applications
4 times during the fruiting season. Benlated benomyll fungicide) was
mixed with each insecticide and both were applied to the trees at the
same time. Benlate was also applied to the test trees at early bloom
for blossom blight control. During the two weeks that the fruit was being
picked from the trees, Pyrenone' crop spray was applied to all trees,
except the check trees, two times at 6 oz. formulation/100 gallons water.
Samples consisted of randomly picking 3/4 bushel of fruit from
each test block at 2 different times. The boxes of fruit were then taken
to A.R.C. for counting and inspection of the fruit for catfacing. At
each picking, a record was obtained of the number of bushels picked from
each test block by the grower. All of the information gathered was cor-
related to determine the effectiveness of each insecticide in controlling
the catfacing insects as expressed in total percentage of fruit damage.
The trees were examined periodically throughout the test for signs of
4W Results and Conclusions
Table 1 lists the insecticides used and their effectiveness in
controlling the catfacing insects at the rates used in this test. Of
the insecticides tested, only Zectra~ 2EC and Imidan- 50W gave completely
satisfactory control of the catfacing insect complex. Although CidialJ'
4E gave economic control of the insects involved, it would have to be
ruled out as a useful insecticide for use on peaches. Cidial 4E was
moderately toxic to the test trees when used at 4 oz./100 gal.1 Also,
in separate tests conducted at the A.R.C., Monticello, orchard in which
Cidial 4E was tested at 16 and 24 oz./100 gal. on Maygold variety peach
trees, severe phytotoxicity occurred. At 16 and 24 oz./l00 gal., the fruit
was severely injured. The symptoms of phytotoxicity at the high rate at
which Cidial 4E was used resembled severe sunscald of the fruit as well
as tree defoliation.
Thiodan 2M was applied to the trees only one time (March 20th) during
the fruiting season. From the data shown in Table 1, it appears that for
Thiodan 2M to give economic control it will have to be applied more than
While Phosvel? 3EC did not protect the trees as well as Zectran 2EC
or Imidan 50W, it is interesting to note that on one block of tree ws.hich
was sprayed with Phosvel 3EC only (no fungicides) scab did not develop
* on the fruit, while trees immediately adjacent to the test trees had moderate
scab infestation on the fruit. Although this block of trees had the highest
percentage of catfaced fruit, this was not unexpected since the trees
were in an area of high insect population pressure from an adjoining wooded
Pencap M-2 (encapsulated Methyl Parathion) when applied at long
intervals, did not give economic control during this test. However, when
Pencap M-2 was applied at 14-day intervals at 4 oz./100 gal. it gave
slightly better control than did parathion 4EC at 5.33 oz./100 gal., applied
every 7 days.
Pyrenone crop spray (Pyrethrins and Technical piperoriyl butoxide)
when applied at 24X concentration at the equivalent rate of 6 oz. form-
ulation/100 gal., caused slight pinhole burning of the foliage. The pur-
pose in spraying Pyrenone was to try to suppress the populations of southern
green stink bugs and the leaf footed plant bugs that are so prevalent at
harvest time. My observations indicated that there was a marked reduction
in the activity of the bugs immediately after spraying and continuing for
24 to 48 hours. This, in my opinion, would not be sufficient control to
warrant recommending this procedure to the grower due to Pyrenone being
phytotoxic and also because of its very high cost to the grower.
I wish to thank Mr. G. Sweat and Mr. E. C. Mcfadden of Peaches of
SFlorida, Inc., for their cooperation and assistance extended me during
1 All rates are expressed as amount of active ingredient/100 gallons H20.
Table 1 Effectiveness of eight insecticides against the catfacing insects
of peaches. Peaches of Florida Orchard, Madison County, Florida,