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c -, AGRICULTURAL RESEARCH AND EDUCATION CENTER AREC-LA Mimeo
LAKE ALFRED, FLORIDA Series 71-23

CITRUS INSECT AND DISEASE SUMMARY
END OF MARCH 1971

Statewide Index of Abundance
I I I I I I
Mid Mar. End Mar. Trend Mid Mar. End Mar. Trend
-2.0
Rust mite

leaves UiL.. 3RARY
A----i---A-_ -7.i ir\.T
1 .5 --

N High for i-
mature fruit \ mites

1.0 High for I A Q! r Ii f FI fir
1c a ------ -------> cver s
Citrus red mite scales; ver
whitefly >WFLY Adu ts
O O ----
Q -> -o-7 Snow sc
-0.5 X
Texas C. mite I Aphid




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: 76% of groves infested (Norm 60%); 53% economic (Norm 40%).
Although population is expected to decrease in April it will continue to be in the
high range and above normal most of the month. Highest districts are West (2.31) South
(2.12) and North (1.50).
Citrus Red Mite: 46% of groves infested (Norm 43%); 15% economic (Norm 17%).
Population is near normal and in the low range. Increase is expected in April with
gradual buildup of infestations in all districts. Highest district is South (.88).
Texas Citrus Mite: 38% of groves infested (Norm 35%); 12% economic (Norm 15%).
This mite was at the normal low level of abundance in March. It will increase in
jApril with the probability of scattered heavy infestations in most districts. Highest
districts are South (.81) and Central (.74).
Six-spotted Mite: 6% of groves infested (Norm 9%); 1% economic (Norm 1%).
Slight increase is expected.
Glover Scale: 88% of groves infested (Norm 79%); 11% economic (Norm 19%).
Population is moderate and near normal; little change is expected; highest district
is South (1.19).
Purple Scale: 78% of groves infested (Norm 79%); 5% economic (Norm 10%).
Population will remain below normal and moderate; highest district is North (1.03).
Chaff Scale: 61% of groves infested (Norm 65%); 2% economic (Norm 12%).
Population will remain below normal and low. Highest district is South (.69).
Yellow Scale: 36% of groves infested (Norm 65%); none economic (Norm 12%).
This scale will remain below normal abundance and unimportant. Highest district is
East (.67).
Black Scale: 18% of groves infested (Norm 29%); 2% economic (Norm 11%).
Population is expected to remain below normal and low through May. Highest district
is West (.62).
Snow Scale: 29% of groves infested; 19% economic.
Population is higher than in any prior month and will increase.
Aphids: 22% of groves infested (Norm 24%); 1% economic (Norm 1%).
Increase will be rapid until mid-April, then decrease. In groves that were defoliated
by cold, aphids will occur on new flush through May.
Whitefly: Adult population will increase to a high level normal for April peak, then decrease
Spray Notes: The main purpose of the post-bloom spray this year is to protect the young
fruit from rust mite and melanose, and to control snow scale in infested areas. In young
groves and groves injured by cold, protect the new foliage from aphids and mites as soon as
these pests appear.


600 April 1, 1971 WAS


W. A. Simanton