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CITRUS EXPERIMENT STATION
LAKE ALFRED, FLORIDA


CITRUS INSECT AND DISEASE SUMMARY
END OF MAY 1969


Statewide Index of Abundance


Mid
May


End
May


Trend
Trend


Rust mite
---Rti


C. red mite -



Texas c. mite


I High for
mites

High for


scales;
whitefly


I
Mid
May


I
End
May


I
Trend


-7 Black sc
S0" 'Inver s
-- '-,---- '~ Whitefly
v "


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

Rust Mite: 72% of groves infested (Norm 44%); 56% economic (Norm 27%).
Population decreased on both leaves and fruit but is still above normal and in the
high range. Although further decrease is expected through June, population will continue
above normal and heavy infestations may be expected in about 20% of groves. Highest
districts are West (2.33) and North (2.00).
Texas Citrus Mite: 38% of groves infested (Norm 59%); 19% economic (Norm 38%).
Population increased slightly and is expected to remain near the present subnormal
level. Highest districts are Central (.84) and North (.78).


Citrus Red Mite: 46% of groves infested (Norm 57%); 18% economic (Norm 32%).
Slight increase is expected through June. Population will remain subnormal,
tered and spotty. Highest districts are West (1.12) and North (1.00).


scat-


Six-spotted Mite: 17% of groves infested; 2% economic.
This mite occurred in near normal numbers, mostly in unsprayed groves. Decrease is
expected.
Glover Scale: 80% of groves infested (Norm 84%); 15% economic (Norm 28%).
Population is near the high range but below normal. Slight increase is expected.
Highest districts are South (1.20) and West (1.00).
Purple Scale: 78% of groves infested (Norm 81%); 8% economic (Norm 12%).
Little change is expected from the current low and subnormal level. Highest dis-
trict is North (1.14).
Chaff Scale: 54% of groves infested (Norm 69%); 2% economic (Norm 15%).
Population will remain subnormal and in the low range.
Yellow Scale: 70% of groves infested (Norm 66%); 6% economic (Norm 11%).
Population is expected to remain near the current moderate level which is slightly
below normal. Highest districts are North (.97) and South (.84).

Snow scale activity is temporarily low.
Black Scale: 44% of groves infested (Norm 48%); 18% economic (Norm 26%).
Population is still below normal but will increase rapidly into the high range.
Highest districts are East (1.55) Central (.71) and West (.70).
Mealybug: 32% of groves infested; 11% economic. Increase from the present normal level
will continue through June. A few heavy infestations are expected through July.
Whitefly population was slightly above the normal May level and will remain high through
July.


Spray Notes: Populations of most scales are below avera
mealybug or black scale are numerous, it may be advisable
July for better scale and greasy spot control. Rust mit
should be controlled before more than 20 percent of leav

625 June 3, 1969 WAS


0e EarL |3hi
to deay the summer spr
will be a continuous th
s or fj~th )ci69 infest

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


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CES Mimeo Series 69-32