\ CITRUS EXPERIMENT STATION CS e S 671
LAKE ALFRED, FLORIDA CES Mimeo Series 67-18
LAKE ALFRED, FLORIDA

CITRUS INSECT AND DISEASE SUMMARY
END NOVEMBER 1966

Statewide Index of Abundance
Mid End Trend Mid End Trend
Nov. Nov. Nov. Nov.
2.0


Rust mite
1.5 ---
.____.. High for
Rust mite
Scales
-1.0 0High for
scales; Yellow
red mite winter high 0C_____ -Gover
for .----- Purple
0. CRM & TCM
0. .. --> Chaff

05 ---. -----
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: 68% of groves infested (Norm 65%); 46% economic (Norm 46%).
Population is near normal and in the high range. Although the gradual decrease will
continue, about 25% of groves will harbor important infestations on both leaves and fruit.
Highest districts are South (2.05) West (1.73) and North (1.48).

Citrus Red Mite: 47% of groves infested (Norm 39%); 17% economic (Norm 13%).
Statewide population increased to above average level. It was characterized by
marked increase in the West (1.33) and North (1.24) districts, moderate increase in
the East district (.47) and slight decrease in the Central (.33) and South (.16)
districts. Scattered heavy infestations will continue to occur, being most numerous
in the high districts,

Texas Citrus Mite: 22% of groves infested (Norm 46%); 9% economic (Norm 19%).
Population increased slightly but continued below average and in the low range.
Increase is expected in December if the dry weather continues. A few scattered groves
will have important infestations. Highest districts are North (.62) and West (.47).

Yellow Scale: 67% of groves infested; 13% economic.
Population is above average and in the moderate range. Slight increase is expected;
few infestations will be heavy. Highest districts are East (1.04) South (.92) and
Central (.84).

Clover Scale: 64% of groves infested; 14% economic,
Population is above average and in the moderate range. Little change is expected.
Highest districts are East (1.09) and Central (1.03).
Purple Scale: Slightly below normal; in moderate range; little change expected.
Chaff Scale: Below normal; in low to moderate range; slight increase expected.
Black Scale: Below normal; in low range; little change is expected.
Whitefly: Below normal; in moderate range; slight increase expected.

Spray Notes: Because of the lack of rainfall many groves are in an extremely dry con-
dition. Dry trees are especially susceptible to mesophyll collapse and "firing" of
leaves when dry winds occur. If the leaves are lost in early winter the twigs will die.
These conditions are much worse where the leaves have been damaged by mites; therefore,
control mites before more than 15% of leaves become infested with rust mite, citrus red
mite or Texas citrus mite. Recommended materials for the control of these 3 mites in
winter are ethion 4 liquid, trithion 4 liquid or delnav 4 liquid at 2.5 pints per 500
gallon. If any one of these phosphatic miticides has failed to give mite control in
the grove to be sprayed, switch to Kelthane MF at 4.0 to 5.0 pints per 500 gallon.
THE NEXT SUMMARY WILL BE ISSUED AT THE END OF DECEMBER.


650-December 7, 1966 WAS


W. A. Simanton