3 HUME LIBRARY


AUG 2 1372

*-*
CS-1972-24
450-8/372-3 A2- a Ai PfaFlorida


AGRICULTURAL RESEARCH AND EDUCATION CENTER LAKE ALFRED, FLORIDA
CITRUS INSECT AND DISEASE SUMMARY
MID-AUGUST 1972 0
Statewide Index of Abundance '.
End July Mid Aug. Trend End July 'Mid Aug. Trend
-2.0 v Frt.
------.. --. "> Black scale

Rust mite
Lvs.


____High for
'K mites 57

1. mieHigh for _
1.0 Texas C. mite scales; W-- hitefly L
whitefly
whitefly -- ---> Glover s( ale
> Snow sca e

-0.5 O I> Mealybug


C. red mite

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: 78% of groves infested (Norm 65%); 65% economic (Norm 51%).
Population attained the summer peak in mid-August and is in the high range and above
normal on both leaves and fruit. Although decrease is expected, numerous groves will continue
to have important infestations. All districts are high: South (2.36) Central (2.04) North
(1.73) West (1.67) and East (1.36).
Texas Citrus Mite: 56% of groves infested (Norm 44%); 33% economic (Norm 21%).
Population decreased but is still above normal and in the moderate range. Rapid decrease
to low level is expected. Highest districts are West (1.64) Central (1.60) and East (1.00).
Citrus Red Mite: 20% of groves infested (Norm 45%); 6% economic (Norm 22%).
This mite is at the lowest August level in 21 years of record. It will remain very low
and of little importance in all districts.
Black Scale: 89% of groves infested (Norm 68%); 75% economic (Norm 47%).
Population decreased but is still the highest on record for August and in the very high
range. Gradual decrease is expected. All districts are high: Central (2.60) West (2.18)
East (2.18) North (1.81) and South (1.38).
Citrus Snow Scale: 38% of groves infested; 27% economic.
Population decreased from the all-time high level reported last month. Slight temporary
decrease is expected.
Glover Scale: 76% of groves infested (Norm 64%); 5% economic (Norm 14%).
Population is below normal and in the moderate range. Decrease is expected. Highest
district is North (1.06).
Purple Scale: 62% of groves infested (Norm 56%); 3% economic (Norm 4%).
This scale is near normal abundance and in the low to moderate range in all districts.
It will decrease until October.
Yellow Scale: 28% of groves infested (Norm 50%); none economic (Norm 6%).
Chaff Scale: 42% of groves infested (Norm 46%); none economic (Norm 4%).
These armored scales are below normal and will occur only as light infestations.
Green Scale: 24% of groves infested; 6% economic. This soft scale has decreased and is in
the low range. However, population is higher than in any prior August on record.
Whitefly: 77% of groves infested; 24% economic.
Population of the larval form has decreased but is still in the high range and above
normal. Adult population is also above normal and higher than the larval population. Highest
districts are East (1.35) and West (1.13).
Mealybug population has dropped into the low range and will continue to decrease.
Spray Notes: Late summer rains are causing rank undergrowth and high humidity which favor
development of brown rot. In groves with a history of this disease it is advisable to chop
down the cover crop to improve ventilation; then apply a copper spray between mid-August and
September. Use enough neutral copper to supply 3.0 pounds of actual copper per 500 gallon
of spray.


W. A. Simanton


August 23, 1972