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AGRICULTURAL RESEARCH AND EDUCATION CENTER


LAn L ALU~lIDL, r LUKR
CITRUS INSECT AND DISEASE
MID-OCTOBER 1971


Statewide Index of Abun


A
SUMMARY LIBRARY
u LIBRARY


-dance ^-o 17
End Sept. id Oct. Trend


I.F.A.S. Univ. of lorida


End Sept. Mid Oct. Trend
Frt. --- -->

&' Lvs.


Rust mite


High for
mites


S-----> WFLY
0- -V -


High for
scales;
whitefly_
I


GlovE
Snow


Citrus red mite -


Texas citrus mite

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


,c------ ->)


- Larvae
- Adults


"Black scale


r scale
scale


Citrus Rust Mite: 88% of groves infested (Norm 67%); 69% economic (Norm 41%).
Population is much above average and very high. Infestations are of similar
both leaves and fruit. Further increase is expected until mid-November. Highest
West (2.27), South (2.25), North (2.12) and Central (2.05). East district is low


magnitude on
districts are:
(1.06).


Citrus Red Mite: 26% of groves infested (Norm 23%); 3% economic (Norm 5%).
Population is still normal and in the low range but has started an upward trend which will
persist through November. Rapid increase may be expected in about 5% of groves. Highest dis-
tricts are West (.50), North (.43) and South (.42).
Texas Citrus Mite: 23% of groves infested (Norm 18%); 3% economic (Norm 4%).
This spider mite is also starting to increase from the normal low level. Heavy infestations
are likely to build up rapidly in scattered groves during the.next 2 months. Highest district
is West (.36).


Glover Scale: 567. of groves infested (Norm 56%); 4% economic (Norm 7%).
This scale increased but is still below normal abundance and in the low range.
increase is expected. Highest districts are West (1.00) and South (.79).


Purple Scale: 46% of groves infested (Norm 53%);
Chaff Scale: 32% of groves infested (Norm 37%);
Yellow Scale: 14% of groves infested (Norm 52%);
Populations of these 3 armored scales are at
change is expected.


1% economic (Norm 2%).
1% economic (Norm 2%).
none economic (Norm 6%).
low level in nearly all districts.


Gradual





Little


Black Scale: 61% of groves infested (Norm 35%); 30% economic (Norm 13%).
Population is at the highest level on record for October. It consists mostly of low or
moderate infestations with very few heavily infested groves. Little change is expected until
cool weather. Highest districts are Central (1.52), East (1.00) and South (1.00).
Snow Scale: 27% of groves infested; 20% moderately or heavily infested. Population will
remain spotty and near the level of the past few months. Activity will become less with the
onset of cooler weather.
Whitefly: 91% of groves infested; 30% economic.
Populations of eggs, larvae and adults increased and are now in the high range and much
above normal. Decrease is expected in November. All districts are high: East (1.64), West
(1.50), Central (1.19), South (1.12) and North (1.03).
Spray Notes: If brown rot should appear on fruit, spray the entire tree immediately. Use
2 pounds of metallic copper in neutral form per 500 gallons of spray. Disc or mow the cover
crop to improve ventilation.


530 October 20, 1971 WAS


2.0 F


1.5




1.0 -


0.5h


1


a l l


AREC-LA Mimeo Series 71-45


W. A. Simanton