S/v CITRUS EXPERIMENT STATION ,
LAKE ALFRED, FLORIDA
E A F CES Mimeo Series 70-5

CITRUS INSECT AND DISEASE SUMMARY
MID-AUGUST 1969

Statewide Index of Abundance
End uly Mid-Aug. Trend End July Mid-Aug. Trend

2.0

Rust mite i

1.5
High for B k
mites x ^ Black sc


1.0 High for
0 C. red mite scales; "--..
O C. red mite whitefly
mealybug Mealybu
Whitefly
0.5 m Glover s
Texas C. mite




NOTE: Only pests or conditions of general or current interest are reported.
Forecasts are for 1 month in advance unless otherwise indicated.
Rust Mite: 79%of groves infested (Norm 59%); 63% economic (Norm 45%).
Population decreased but is still much above normal and in the very high range. Although
further decrease is expected, most districts will continue to have high populations. In-
festations will be higher on fruit than on leaves. All districts currently are high: West
(2.50), East (2.00), North (1.78), Central (1.71) and South (1.53).
Texas Citrus Mite: 38% of groves infested (Norm 46%); 22% economic (Norm 21%).
Population is near normal and low for the state as a whole but considerable difference
exists among districts. Further decrease is expected. Highest districts are East (1.31)
and North (1.00).
Citrus Red Mite: 45% of groves infested (Norm 44%); 21% economic (Norm 22%).
This mite is at the normal low level for August. Decrease is expected until late
September. Highest district is East (1.15).
Glover Scale: 66% of groves infested (Norm 61%); 13% economic (Norm 15%).
Population is near normal and moderate. Decrease to the low range is expected. High-
est districts are North (1.27) and East (.92).
Purple Scale: 45% of groves infested (Norm 56%); 5% economic (Norm 6%). Population
is below normal and low to moderate in all districts. Further decrease is expected.
Chaff Scale: 43% of groves infested (Norm 48%); 4% economic (Norm 4%).
This scale is near the normal low level of abundance for August. Little change is
expected. Highest district is North (.80).
Yellow Scale: 53% of groves infested (Norm 55%); 8% economic (Norm 6%).
Population is at the normal moderate level. Slight decrease is expected. Highest
districts are North (1.13) and East (.69).
Black Scale: 76% of groves infested (Norm 68%); 57% economic (Norm 49%).
Population is decreasing but is still above normal and in the high range in all
districts. Although further decrease is predicted, population will remain high until early
September. Highest districts are East (2.15), Central (1.71) and South (1.50).
Snow Scale: 20% of groves infested; 9% with moderate to heavy infestations. Population
is greater than in prior months and is expected to increase due to spread to previously
uninfested trees.
Whitefly: 55% of groves infested; 21% economic. Population dropped to moderate level and
will decrease further through September.
Mealybug: 68% of groves infested; 16% economic PpAe wi cpnn- Population is
now in the moderate range but still above norm "- IPolRY

Note: Survey groves that received pest control treat mnt within the pri r 30 days are not
included in calculation of "percent groves inf sted." "lr e tA economic excludes the
light infestations and refers only to groves w th heavy (damaging) infe nations or moderate
(threatening) infestations. i U ori
iv.600 August 19, 1969 WAS of. A. Simanton
600 August 19, 1969 WAS W-- ----""" A. Simanton