/00 o 0 CITRUS EXPERIMENT STATION
LAKE ALFRED, FLORIDA CES Mimeo Series 69-10

CITRUS INSECT AND DISEASE SUMMARY (No Summary was issued at
END OF SEPTEMBER 1968 mid-September)

Statewide Index of Abundance
End Aug. Mid End Trend End lid End .Trend
-2.0 Sept. Sept. Aug. Sept. Sept.


Rust mite on fruit
-1.5
.v'- High for
mites
A High fs.
-. f- r .---------
.---- scales Black scale


^.5 Whitefly
-0.5 x_ a-<-
SC. red mite
o *... \.s ---Glov r sc.
"4 eal ybug
13 --- -[1- ~ >
Texas C. mite-,
NOTE: Only pests or conditions of general or current interest are reported.
Forecasts are for 1 month in advance unless otherwise indicated.
Rust Mite: 52% of groves infested (Norm 57%); 30% economic (Norm 35%).
Population decreased to the normal September level at mid-month and remained in the
low range until month end. Increase is expected through October. About 25% of groves
will develop heavy infestations on fruit. Highest districts are West (1.64) South (1.44)
and North (.97).
Texas Citrus Mite: 10% of groves infested (Norm 17%); less than 1% economic (Norm 4%).
This mite is at the lowest September level since 1955. Increase is expected in
late October but population is expected to continue in the low range in all districts.
Highest district is North (.17).
Citrus Red Mite: 12% of groves infested (Norm 24%); less than 1% economic. (Norm 4%).
Population is the lowest for September in 18 years of record. It will remain low
despite the gradual increase expected in October. Highest district is East (.25).
Black Scale: 35% of groves infested (Norm 38%); 13% economic (Norm 15%).
Population dropped out of the high range early in September and was in the normal
low range at month-end. Little change is expected. Highest district is East (.95).
Glover Scale: 28% of groves infested (Norm 56%); 1% economic (Norm 9%).
September population was the lowest since 1961. It will remain below average and
in the low range through October. Highest district is West (.50).
Purple Scale: 16% of groves infested (Norm 50%); less than 1% economic (Norm 2%).
This scale is at the lowest September level in 18 years of record. Infestations
will continue to be very light in all districts.
Chaff Scale: 9% of groves infested (Norm 35%); less than 1% economic (Norm 3%).
September population of this species was the lowest recorded in any month since
June 1951. It will continue to be very low.
Yellow Scale: 32% of groves infested (Norm 49%); less than 1% economic (Norm 7%).
This scale was also much below normal and was at the lowest September level since
1961. Little change is expected.
Snow Scale: 13% of groves infested; 1% economic. Activity diminished in September but
is expected to intensify in October.
Whitefly: 52% of groves infested; 14% economic. Population is increasing but is expected
to remain near the moderate level normal for October. Adults will be less numerous.
Spray Notes: The 30-day weather outlook is for above normal rainfall. If brown rot should
appear, a spray of 3.5 lbs. of 53% tribasic copper sulfate (or equivalent) per 500 gal.
applied immediately to the entire tree will give some control.


625 October 3, 1968 WAS


W. A. Simanton