>- CITRUS EXPERIMENT STATION
CES Mimeo Series 70-21
LAKE ALFRED, FLORIDA

CITRUS INSECT AND DISEASE SUMMARY
MID-FEBRUARY 1970

Statewide Index of Abundance
End Mid End Mid
Trend Trend
Jan. Feb. Jan. Feb.
-2.0


Rust mite leave>
-1.5 A-.

__-- High for
~rust mite

Rust mite fruit-" Whitefly>
1i.0 _High for
scales,whitef y; V
C. red mite winter high Purple s
C. red mite for CRM, TCM ---- -o Yellow s
O -0----
0.5



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: 75% of groves infested (Norm 61%); 45% economic (Norm 42%).
Decrease is expected to take population out of the high range for the first time in
12 months. However, the population will still be slightly above normal and may soon in-
crease. Highest districts are West (1.92) East (1.59) and North (1.35).
Citrus Red Mite: 43% of groves infested (Norm 36%); 14% economic (Norm 14%).
Population is near normal and in the low range. Little change is expected. Highest
districts are West (.92) and North (.71).
Texas Citrus Mite: 23% of groves infested (Norm 31%); 6% economic (Norm 11%).
Population is below normal and will remain very low. Highest district is West (.69).
Six-spotted Mite: 2% of groves infested; none economic. Gradual increase expected.
Glover Scale: 78% of groves infested (Norm 78%); 7% economic (Norm 17%).
Population is below normal and moderate with little change expected. Highest districts
are East (1.00) and West (1.00).
Purple Scale: 70% of groves infested (Norm 77%); 7% economic (Norm 9%).
Population is near normal and moderate except in North district (1.03) which has 2%
of groves with heavy infestations. Little change is expected.
Chaff Scale: 42% of groves infested (Norm 64%); 2% economic (Norm 10%).
Population will remain below normal and low in all districts.
Black Scale: 18% of groves infested (Norm 36%); 3% economic (Norm 15%).
Population will remain subnormal and very low in all districts.
Yellow Scale: 60% of groves infested (Norm 62%); 8% economic (Norm 14%).
Population decreased slightly. It will remain at low to moderate level in most
districts. A few scattered infestations are heavy. Highest district is North (.87).
Snow Scale: 25%of groves infested; 8% with moderate to heavy infestations. Population is
the highest on record for February and will increase.
Whitefly population is above normal for January and may enter the high range.
Spray Notes: Aphids are presently scarce but are expected to increase rapidly on new
growth in March. Meta-Systox-R at 5 pints per 500 gallon can be used as an aphicide only
on trees that are not expected to bear fruit for one year. Systox 2 liquid at 5 pints
is cleared for use on bearing orange, grapefruit and lemon trees with a 21 day waiting
period between application and harvest. Phosphamidon 8 liquid at 5 pints may be used
on mature orange, grapefruit, tangerine or lemon trees provided there is a 15 day waiting
period. Dimethoate 2.67 liquid at 4 pints per 500 gallon is registered for use only on
mature orange and lemon trees with a 15 day waiting period. All of these aphicides have
systemic action but require thorough and timely coverage of new foliage to be effective.


600 February 18, 1970 WAS


W. A. Simanton