CITRUS EXPERIMENT STATION CES Mimeo Series 68-6
;LAKE ALFRLD, FLORIDA

CITRUS INSECT AND DISEASE SIUMARY
MID-AUGUST 1967

Statewide Index of Abundance
Sd Mid Trendy Mid Trend
-20 July Aug. Aug.



Black
1.5 Rust Mie
SHich for
mites

1.o \I igh for "' -- -i nvr
Texas C. mite scales

O 0 -------->Yellow
-0.5

.5. red mite Scales




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

Rust Mite: 73% of groves infested (Norm 537%); 56% economic (Norm 38%).
Population attained the summer peak in early August, and it was much greater than
normal. Although widespread decrease is expected through mid-September, some groves in
all districts will harbor important infestations. Infestations will be heavier on fruit
than on leaves. Highest districts are West (2.50) South (2.1.) North (1.73) and Cen-
tral (1.67).
Texas Citrus Mite: 54% of groves infested (Norm 45%): 17% economic (Norm 21%).
Population is decreasing and is near normal for August. It will be in the low range
through September. Highest districts are West (1.11) and East (1.06).
Citrus Red Mit: 33% of groves infested (Norm 46%); 19% economic (Norm 25%).
This mite is decreasing and is below normal abundance for August. It will be in the
low range statewide through September and of little importance. Highest districts are
West (1.11) and East (.88).
Glover Scala: 79% of groves infested; 25% economic. Population is above normal and in
the high range. Decrease to the moderate range is expected. Highest districts are
South (1.60) East (1.12) and West (1.11).
Black Scale: 85% of groves infested; 60% economic. Population is decreasing rapidly but
is still above normal and in the high range. Further decrease is expected through November.
Highest districts are East (2.29) West (2.1.1) South (2.07) and Central (1.64).
Purole Scale: 61% of groves infested; 1% economic. Population is normal and low and will
remain low. Highest district is West (.78).
Chaff Scale: 58% of groves infested; 1% economic. Population is generally low and will
be of little importance. Highest district is West (.89).
Yellow Scal: 69% of groves infested; 4% economic. This scale is more common than usual
for August but very few infestations are important. Decrease is expected. Highest
district is Central (.86).

Whitefly is below ..,rmal abundance and is expected to remain in the low range.

Ma:Lybuv has dropped into the low range and will remain low.

y oces: Groves with a history of brown rot should receive a preventive spray in
-ugust. Use neutral copper at the rate of 1.87 pounds of metallic copper per 500 gallons
and apply to the lower 6 ft. of the tree. The rot is favored by prolonged moisture on
the tree. Chopping the cover crop and pruning trees to improve ventilation will reduce
the likelihood of infection.


"0 August 16, 1967 WAS


W. A. Simanton