HUME LIBRARY


f \ 1 1972
*-*
CS-1972-21
FA.S.- Ui. Of F d 450-7/18/72-WAS-Lake Alfred, Fla.
I.F.A.S. Univ. of Florida

AGRICULTURAL RESEARCH AND EDUCATION CENTER LAKE ALFRED, FLORIDA
CITRUS INSECT AND DISEASE SUMMARY /
MID-JULY 1972 Black scale
0- Black scale
Statewide Index of Abundatce
End June Mid July Trend 'End June Mid July Trend
2.0 /
Rust mite on fruit

on leaves -- 4

1.5 -
/ Texas C. mite High for

V mites -

1.0 High for
scales; ------ __ "\Mealybug
whitefly ~ > Glover s ale


-0.5 O---------- > x----->Snow
Snow scale

0.5 0
C. red mite




NOTE: Only pests or conditions of general or current interest are reported.
Forecasts are for I month in advance unless otherwise indicated.
Citrus Rust Mite: 82% of groves infested (Norm 65%); 57% economic (Norm 42%).
Population is much above average and very high on both leaves and fruit. It will con-
tinue to increase through July on leaves and through August on fruit, then decrease. Highest
districts are South (2.50) West (2.00) Central (1.83) and North (1.22).
Texas Citrus Mite: 76% of groves infested (Norm 74%); 55% economic (Norm 52%).
Population is slightly above normal, near the summer peak, and in the high range. De-
crease is expected. Highest districts are Central (2.24) West (1.85) East (1.71) and South (1.45)
Citrus Red Mite: 40% of groves infested (Norm 70%); 10% economic (Norm 42%).
This mite is at the lowest July level in 21 years of record. Population will continue
in the low range. Highest districts are South (1.05) and West (.69).
Black Scale: 97% of groves infested (Norm 83%); 91% economic (Norm 63%).
Population is the highest recorded at any time in 21 years of record. Decrease is
expected in August. All districts are very high: East (2.76) Central (2.73) South (2.65)
North (2.41) and West (2.31).
Snow Scale: 38% of groves infested; 22% economic.
Population is greater than in any prior month. Slight increase is expected.
Glover Scale: 82% of groves infested (Norm 82%); 7% economic (Norm 24%).
Population is below normal, in the moderate range and decreasing. Highest district is
SSouth (1.05). 1972 population is the lightest since 1962.
Purple Scale: 72% of groves infested (Norm 75%); 3% economic (Norm 10%).
Population is below normal and at low or moderate level in all districts. Decrease is
expected.
Yellow Scale: 45% of groves infested (Norm 64%); none economic (Norm 9%).
Chaff Scale: 41% of groves infested (Norm 60%); none economic (Norm 8%).
These two scales will continue below normal and at low level in all districts.
Green Scale: 30% of groves infested (Norm 7%); 16% economic (Norm 2%).
This soft scale is more numerous than at any time in 21 years of record. It occurs in
the East, Central and South districts. It will persist until cold weather occurs.
Whitefly: 88% of groves infested; 30% economic.
Population is above normal and in the high range. Little change is predicted. Highest
districts are East (1.86) and West (1.33).
Mealybug: 77% of groves infested; 22% economic.
The summer peak of population occurred in late June. It reached the high range but was
below normal.
NOTE: THIS CITRUS INSECT AND DISEASE SUMMARY AND FORECAST WILL BE DISCONTINUED AFTER AUGUST.
PLEASE READ THE ENCLOSED MEMORANDUM.

July 18, 1972 W. A. Simanton