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CITRUS EXPERIMENT STATION CES Mimeo Series 71-19
LAKE ALFRED, FLORIDA

CITRUS INSECT AND DISEASE SUMMARY
END OF JANUARY 1971

Statewide Index of Abundance
End Dec Mid Jan End'Jan Trend ndd Dec Mid Jan End Jan Trend

Rust mite Lvs.
--------- -- ------L~--..
--- --- HUME LIBRARY

5 V---
Rust mite Frt. FEB 18 1371
High for
rust mite
Hih fo I.F.A.S. Univ. of Florida
S_________________________ High for ____
Citrus red mite scales; white- ,. ---- ------>Glover sc
S ---O fly; winter *-_ ===== -Purple sc
O- ) high for -- --WFLY L
O- D CRM & TCM .--> Snow sc

Texas C. mite oYell
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: 83% of groves infested (Norm 63%); 61% economic (Norm 46%).
Population continued above normal and very high. Decrease is expected. Population
on leaves is slightly higher than on fruit. Highest districts are West (2.47) South
(2.12) Central (1.91) and North (1.67). About 30% of groves will be heavily infested.
Citrus Red Mite: 55% of groves infested (Norm 36%); 23% economic (Norm 12%).
Population increased and is now well above normal although still at low level in most
districts. Decrease is expected. Highest districts are South (.96) and North (.90).
Texas Citrus Mite: 43% of groves infested (Norm 33%); 17% economic (Norm 12%).
This mite also increased and is now above the January normal. Decrease to the
normal low level is expected. Highest districts are Central (1.03) and South (.58).
Six-spotted mites are starting to appear in a few groves.
Glover Scale: 89% of groves infested (Norm 78%); 6% economic (Norm 15%).
This scale will continue to be at moderate level and near normal abundance. Highest
districts are South (1.16) and West (1.00).
Purple Scale: 77% of groves infested (Norm 77%); 3% economic (Norm 7%).
Population is at the normal low level for January. Little change is expected.
Highest districts are West (.94) and North (.93).
Black Scale: 33% of groves infested (Norm 37%); 12% economic (Norm 17%).
Population will remain below normal and decrease farther into the low range. There
is considerable difference among districts: West is high (1.00) and South is low (.08).
Chaff Scale: 50% of groves infested (Norm 59%); 1% economic (Norm 10%).
Population is below normal and at low level in all districts. Little change is
expected.
Yellow Scale: 37% of groves infested (Norm 60%); 2% economic (Norm 12%).
Statewide population is the lowest on record for January and will decrease further.
Infestations are light in all districts except East (.71).
Snow Scale: 29% of groves infested; 16% with moderate or heavy infestations. Population
increased'and is now higher than in any prior January. Further increase is expected.
Whiteflies are at the normal moderate level for January. Decrease will occur until late
February; then a gradual increase is expected.
Spray Notes: For scab-susceptible groves a spray should be applied just before trees
begin to flush. Use ferbam 76% WP at 7.5 pounds or a copper compound at 3.75 to 7.5
pounds of metallic copper per 500 gallons. Miticides and nutritional materials may be
included in this spray if needed.


600 February 3, 1971 WAS,


W. A. Simanton