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A.S. Univ. of F!ro-
----- ..---..Sta1


CITRUS EXPERIMENT STATION
LAKE ALFRED, FLORIDA
WAY 12 1970
CITRUS INSECT AND DISEASE SUMMARY
END OF APRIL 1970


:ewide Index of Abundance


-2.0


Mid
Apr.


End
Apr.


Trend


Rust mite-leaves


-1.5


-1.0


4---'
High for
mites

High for


C. red mite

___0


-0.5


o --- --->
Texas C. mite


scales;
whitefly


Mid
Apr.


End
Apr.


Trend


---


AW
Whitefly \
Ly


o ,,---- Glover sc

O O --- Yellow sc
0 ----- 0~~~c


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: 71% of groves infested (Norm 63%); 57% economic (Norm 40%).
Population advanced farther into the high range and is above average. Further in-
crease is expected. Highest districts are West (2.00) South (1.65) Central (1.42) and
East (1.41).
Citrus Red Mite: 40% of groves infested (Norm 49%); 21% economic (Norm 19%).
Population increased but is still below normal and in the low range. Increase is
expected to continue. Highest districts are North (.77) and South (.71).


Texas Citrus Mite: 24% of groves infested (Norm 49%); 11% economic (Norm 24%).
Population is at the lowest April level in 11 years. It will remain in the
in all districts despite an expected increase. Highest district is South (.57).


low range


Six-spotted Mite; 12% of groves infested (Norm 9%); 2% economic (Norm 1%).
Population is near normal. It will increase through May and then decrease rapidly.
Scattered groves that did not receive a miticide post-bloom may develop heavy infesta-
tions that can cause leaf drop.
Glover Scale: 79% of groves infested (Norm 82%); 10% economic (Norm 19%).
Population is below normal and moderate; increase is expected. Highest districts
are West (1.00) North (.96) and East (.95).
Purple Scale: 69% of groves infested (Norm 82%); 5% economic (Norm 11%).
This scale is below normal and at moderate level; little change is expected.
Highest districts are West (1.00) and North (.83).

Yellow Scale: 61% of groves infested (Norm 64%); 4% economic (Norm 9%).
Chaff Scale: 46% of groves infested (Norm 64%); 2% economic (Norm 11%).
Black Scale: 5% of groves infested (Norm 26%); none economic (Norm 10%).
The above 3 scales are below normal abundance and in the low range; all are expected
to increase gradually.
Snow Scale: 26% of groves infested; 7% with moderate or heavy infestations. Population
is the highest on record for April. Increase is expected.


Whitefly: 72% of groves infested (Norm 63%); 15% economic (Norm 7%).
Adult, egg and larval forms were much above normal abundance in April.
of larvae is expected to increase into the high range.


Population


Mealybug population is expected to continue to be low until June.
Spray Notes: Where melanose control on fruit is important the post-bloom fungicidal
spray should be on the trees by this date.
With harvest of Valencia oranges under way, it is important to comply with the
required waiting period for harvest following the post-bloom spray. See the 1970 Florida
Citrus Spray and Dust Schedule for details.


600 May 4, 1970 WASA. Simanton
W. A. Simanton


CES Mimeo Series 70-29


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