0,3 (A\


CITRUS EXPERIMENT STATION
LAKE ALFRED, FLORIDA


CES Mimeo Series ;69-8


CITRUS INSECT AND DISEASE SUMMARY
MID-AUGUST 1968


Statewide Index of Abundance
FR


-2.0


End
July
,W"


id
Aug.
-


Trend
Frt.


Lvs.
b


Rust mite


-1.5


.0 Texas C. mite
0 o



.5
C. red mite'


\ High for


mites

High for X


scales


EnJu
July


Mid
Aug.


Trend


1o


Black scale


N.


V -~" Mea bug
Whitefly' -


Glover scale


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

Rust Mite: 78% of groves infested (Norm 56%); 64% economic (Norm 41%).
The summer peak of population occurred early in August and was at very high level
and much above normal. Infestation on fruit is higher than on leaves. Decrease is
expected. All districts are in the high range: West (2.50) Central (2.00) South (1.69)
East (1.54) and North (1.53).


Texas Citrus Mite:
Population is
expected. Highest


47% of groves infested (Norm 46%); 26% economic (Norm 21%).
near normal and in the moderate range with decrease to the low range
districts are West (1.45) and Central (1.00).


Citrus Red Mite: 39% of groves infested (Norm 45%); 15% economic (Norm 24%).
Population is below normal and in the low range with further decrease expected.
Highest district is West (.91).
Black Scale: 79% of groves infested (Norm 66%); 64% economic (Norm 44%).
Population is still high in all districts but is decreasing. It is expected to
drop to the moderate range by September. Highest districts are Central (2.47) East (2.45)
and West (2.09).


Glover Scale:
Purple Scale:
Chaff Scale:
Yellow Scale:
Snow Scale:


61%
42%
22%
50%
15%


groves
groves
groves
groves
groves


infested (Norm 60%); 1% economic (Norm 18%).
infested (Norm 58%); less than 1% economic (Norm
infested (Norm 54%); less than 1% economic (Norm
infested (Norm 56%); less than 1% economic (Norm
infested; 4% economic (No norms established).


Except for snow scale, the other four armored scales listed above are all below nor-
mal abundance and in the moderate or low range in all districts. Little change is expected.

Mealybug: 69% of groves infested; 15%-economic. Population is moderate and slightly
above normal. Decrease is expected.

Whitefly: 45% of groves infested; 25% economic. Population is near normal and moderate
with decrease expected.

Spray Notes: Ample rainfall and the resulting lush growth of cover crops cause high
humidity that favors brown rot in citrus fruit. In groves where this disease has been
troublesome in the past, a spray containing 3.5 lbs of 53% tribasic copper sulfate
(or equivalent) should be applied about mid-August to the lower 6 feet of the tree.
Where brown rot is only an occasional problem, apply the same mixture immediately at
first appearance of the disease and spray the entire tree. Chopping the cover crop
helps to lower humidity...

6 H AgU L13A1 MI
625 August 16, 1968 WAS 2I gg W. A. Simanton



SI.F.A S.- .....
1 .._-I-r i-


-0


4%).
5%).
8%).


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