/ v CITRUS EXPERIMENT STATION
LAKE ALFRED, FLORIDA *-*
CES Mimeo Series 71-16
CITRUS INSECT AND DISEASE SUMMARY
END OF NOVEMBER 1970

Statewide Index of Abundance
Mid Nov End Nov Trend Mid Nov End Nov Trend
I I '
-~ Leaves /
-2.0 --- A
Fruit / AR

Rust mite
-1.5
High for .-A f
rust mite '- f OrIG,

High for"_
scales; ._-> Glover s,
whitefly;
winter high --> Puple s
C. red mite for CRM & TC Whitefly L
0.5
-0.5 ---- Snow sc
Texas C. mite- now sc



NOTE: Only pests or conditions of general or current interest are reported.
Forecasts are for 1 month in advance unless otherwise indicated.

Citrus Rust Mite on Leaves: 88% of groves infested (Norm 68%); 72% economic (Norm 47%).
Citrus Rust Mite on Fruit: 86% of groves infested (Norm 68%); 69% economic (Norm 48%).
Population decreased for the first time in 2 months. It is the highest in 19 years
for late November. It will remain in the high range on both leaves and fruit despite
a further substantial decrease. Highest districts are: South (2.53) West (2.42)
Central (2.32) North (1.88) and East (1.29).
Citrus Red Mite: 37% of groves infested (Norm 32%); 12% economic (Norm 9%).
Population is slightly above normal but in the low range. Little change is expected.
Highest districts are South (.67) and Central (.64).
Texas Citrus Mite: 35% of groves infested (Norm 33%); 11% economic (Norm 14%).
Population is near normal and low. Slight decrease is expected. Highest districts
are Central (1.04) and North (.37).
Glover Scale: 86% of groves infested (Norm 66%); 7% economic (Norm 12%).
Purple Scale: 77% of groves infested (Norm 64%); 3% economic (Norm 6%).
These two species are above normal abundance and at moderate population levels.
Little change is expected. Highest districts for Glover scale are South (1.09) North
(1.00) and West (1.00). Highest district for purple scale is Central (.93).
Black Scale: 51% of groves infested (Norm 34%); 24% economic (Norm 11%).
Population is above normal and at moderate level. Decrease is expected. Black scale
is high in Central (1.21) East (1.13) and West (1.12) districts and very low in North (.59)
and South (.29) districts.
Yellow Scale: 44% of groves infested (Norm 57%); 1% economic (Norm 8%).
Chaff Scale: 43% of groves infested (Norm 46%); 1% economic (Norm 4%).
These scales are below normal abundance and will remain at low level in all districts.
Snow Scale: 25% of groves infested; 15% with moderate or heavy infestation. Population
will continue near the present level which is near the record high set in September 1970.
Further spread and intensification is expected.
Whitefly: 74% of groves infested; 2% economic.
Population decreased and is now at moderate level although still slightly above
normal for November. Further decrease is expected. Highest district is East (1.00).
Spray Notes: Where sprays are applied during the harvest season, be sure to observe
the required waiting periods between time of application and harvest. These are given
in the 1970 Florida Citrus Spray and Dust Schedule. No waiting days are required for
chlorobenzilate, Delnav, and ethion used as recommended, but other pesticides may involve
waiting time.

THE NEXT ISSUE OF THIS SUMMARY WILL BE RELEASED EARLY IN JANUARY, 1971


600 December 8, 1970 WAS


W. A. Simanton