AGRICULTURAL RESEARCH AND EDUCATION CENTER
LAKE ALFRED, FLORIDA
CITRUS INSECT AND DISEASE SUMMARY
Statewide Index of Abundance
>r. Trend End' Ma:
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: 68% of groves infested (Norm 61%); 47% economic (Norm 41%).
Population decreased and will continue to decline. It is expected to drop out of
the high range and be at normal level for the first time in a year. Highest districts
are West (1.93) South (1.92) and Central (1.43).
Citrus Red Mite: 46% of groves infested (Norm 48%); 17% economic (Norm 17%).
Population is at the moderate level normal for April. Rapid increase is
for May. Heavy infestations are likely to develop in 15% of groves. Highest
are South (1.15) and East (.74).
Texas Citrus Mite: 37% of groves infested (Norm 41%); 13% economic (Norm 19%).
This mite also will increase in April and May but will be in the normal moderate
range. Heavy infestations may be expected in about 12% of groves. Highest districts
are South (.96) and Central (.76).
are likely to have
7% of groves infested; 1% economic.
normal for April. Slight increase is expected but only 2% of groves
Glover Scale: 86% of groves infested (Norm 80%); 10% economic (Norm 22%).
Population is below normal and moderate. Little change is expected. Highest district
is South (1.15).
Purple Scale: 79% of groves infested (Norm 81%); 5% economic (Norm 12%).
This scale will remain below normal and at moderate level. Highest district is
Chaff Scale: 52% of groves infested (Norm 63%); 1% economic (Norm 12%).
Population will remain low, and below normal in all districts.
Black Scale: 13% of groves infested (Norm 26%); 2% economic (Norm 10%).
Statewide population will continue below normal and low but sharp increases are ex-
pected in scattered groves in East and West districts.
Yellow Scale: 37% of groves infested (Norm 66%); none economic (Norm 11%).
April population is the lowest since 1963. It will remain unimportant.
Snow scale will be inactive through April but increase is expected in May.
Aphids reached their spring peak at mid-April below normal level.
Whiteflies (Larvae) and Mealybug will continue below normal and low through April, then
increase rapidly in May.
Spray Notes: The postbloom spray is important to control rust mite, melanose, scab
(2nd application) and snow scale. Nutritionals can be added in this spray. See the
1971 Spray and Dust Schedule for the recommended mixtures and the correct timing.
600 April 16, 1971 WAS
W. A. Simanton