b .*-*. ...
CITRUS EXPERIMENT STATION CES Mimeo Series 68-15
LAKE ALFRED, FLORIDA

CITRUS INSECT AND DISEASE SUMMARY
END OF NOVEMBER 1967

Statewide Index of Abundance
Mid End Mid End
Trend Trend
Nov. Nov. Nov. Nov.
-2.0
---- .... Leaves
--- -7..

Rust mite

-1.5 Fruit
High for
rust mite Scales
Scales

-1.0 High for
scales;
winter high --Glover
Texas C. mite Yellow
CRM & TCM Yellow
-0.5


C. red 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 on Leaves: 85% of groves infested (Norm 66%); 63% economic (Norm 44%).
on Fruit: 83% of groves infested (Norm 65%); 61% economic (Norm 44%).
Population on both leaves and fruit is at the highest November level in 16 years of
record. Although decrease is expected, population will be in the high range in most
districts and about 30% of groves will have important infestations. All districts are
high: South (2.17) West (2.08) Central (1.86) North (1.83) and East (1.44).

Texas Citrus Mite: 28% of groves infested (Norm 36%); 12% economic (Norm 15%).
Population is presently below normal and very low. Increase will occur and scat-
tered groves will develop heavy infestations. Highest districts are North (.81)
West (.46) and Central (.41).

Citrus Red Mite: 26% of groves infested (Norm 36%); 8% economic (Norm 10%).
Population is below normal and very low. Increase is expected and some important
infestations will develop. Highest districts are East (.60) and North (.42).

Glover Scale: 70% of groves infested; 7% economic. Population is below normal and
low; no change is expected. Highest districts are East (1.09) and West (1.00).

Purple Scale: 50% of groves infested; 1% economic. Population will continue very low
and unimportant.

Yellow Scale: 56% of groves infested; 3% economic. Population is below average and in
the low range. Increase is expected. Highest district is East (.86).

Chaff Scale: 36% of groves infested; 2% economic. Population is at the lowest November.
level in 16 years of record.

Snow Scale: 14% of groves infested; mostly as light to moderate infestations.

Green scale and wax scale are more abundant than normal for November but neither is of
importance.

Spray Notes. Dry weather in early winter favors mesophyll collapse, leaf drop and the
"firing" condition in which leaves die and remain on the tree. Where these are severe,
twigs and branches will die. Loss of leaves is always greater where mite damage has
occurred. Control mites before 20% of leaves are infested and try to maintain adequate
soil moisture.


650 December 5, 1967 WAS


W. A. Simanton