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CES Mimeo Series 70-24


CITRUS INSECT AND DISEASE SUMMARY
MID-MARCH 1970


Statewide Index of Abundance


End
Feb.


Mid
Mar.


Trend
Trend


Rust mite


Leaves

-__- -- -- ..- High for


Fruit


S0- --- --
C. red mite


Texas C. mite


rust mite

High for


End
Feb.


I
Mid
Mar.


I
Trend


-- > Whitefly
v _---- --- > Glover s
5 -


0 0-- > Yellow s


7 Aphids



",--Z^


scales,
whitefly;
winter high
for CRM,TCM


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

Citrus Rust Mite: 74% of groves infested (Norm 61%); 42% economic (Norm 41%).
Population increased on leaves and remained in the high range, but decreased to the
moderate range on fruit. Both levels are slightly above normal. Little change is ex-
pected. Highest districts are West (1.53) South (1.48) and East (1.45).
Citrus Red Mite: 48% of groves infested (Norm 39%); 18% economic (Norm 15%).
Population increased and is slightly above normal for March but is still in the low
range. Little change is expected. Highest district is West (.94).


Texas Citrus Mite: 20% of groves infested (Norm 31%); 3% economic (Norm 14%).
Population is below average and in the very low range. It will remain low.
district is West (.56).


Highest


Six-spotted Mite: 6% of groves infested; 1% economic. This is the normal population level
for March. Gradual increase is expected.
Glover Scale: 82% of groves infested (Norm 80%); 10% economic (Norm 16%).
Population is below normal and in the moderate range. Little change is expected.
Highest districts are South (1.04) and East (1.00).
Purple Scale: 68% of groves infested (Norm 79%); 6% economic (Norm 9%).
This scale is below normal and in the low range. Slight increase is expected.
Highest district is West (.94).


Chaff Scale: 48% of groves infested (Norm 61%); 2% economic (Norm 10%).
Population is below normal and in the low range. Little change is expected.
district is North (.61).
Black Scale: 13% of groves infested (Norm 30%); 2% economic (Norm 13%).
This scale is starting to recover from the cold weather set-back in January.
lation is much below normal and very low. Highest district is West (.69).


Highest



Popu-


Yellow Scale: 61% of groves infested (Norm
Population is near the normal moderate
Highest districts are North (1.00) and East


63%); 9% economic (Norm 12%).
level for March. Slight increase is expected.
(.86).


Citrus Snow Scale: 25% of groves infested; 8% with moderate infestations. Population is
low but is the highest on record for February. Increase is expected.
Whitefly: 59% of groves infested; 37% economic. Population is in the high range and is
higher than in March of the prior 18 years. Further increase is expected.


Aphids: 8% of groves infested. Infestations are light to date but will increase and
intensify greatly until late April.
Spray Notes: Aphid control is always important on UMEti BA es such as Temp
Aphid and mite control is also important for y ng trees and for cod-da aged trees
where vigorous foliage growth should be mainta ied. N 3
JUN 3 1970


600 March 18, 1970 WAS


W.
I.F.A.S. Univ. of Florida
I


le.


k. Simanton


-2.0


-1.0


-0.5


4. I-


CITRUS EXPERIMENT STATION
LAKE ALFRED, FLORIDA