CITRUS EXPERIMENT STATION
LAKE ALF RED, FLORIDA

CITRUS INSECT AND DISEASE SUMM1ARY
MITD-IMAY 1968

Statewide Index of Abundance
SApEnd
Trend
Apr.


CES Mimeo Series 68-29


NOTE: Only pests or conditions of general or current interest are reported.
Forecasts are for I month in advance unless otherwise indicated.
Rust Mite: 74% of groves infested (Norm 52%); 47% economic (Norm 33%).
Population is above normal and in the high range. Infestation of new fruit is about
one-third that of leaves. increase on fruit will become more rapid in June. Highest
districts are South (2.00) Central (1.96) West (1.50) and East (1.39).
Texas Citrus Mite: 58% of groves infested (Norm 52%); 34% economic (Norm 28%).
Population is above normal and increasing. Although statewide population is still in
the moderate range, all districts have some groves with heavy infestations and more will
occur. Highest districts are South (1.74) East (1.29) and Central (1.21).
Citrus Ped Mite: 53% of groves infested (Norm 52%); 30% economic (Norm 26%).
Fopula:ion is near normal and moderate. Little change is expected until June.
A few groves will have heavy infestations. Highest districts are East (1.48) West (1.13)
and North (.07).
Six-spotted li-te will remain below average and of little importance.
Glover Scale: 78% of groves infested (Norm 83%); 13% economic (Norm 30%).
Population is below average and still in the moderate range. Slight increase is
expected. Highest districts are East (1.48) and South (.96).
Purple Scale: 72% of groves infested (Norm 82%); 1% economic (Norm 12%).
This is the lowest population on record for May. Slight increase is expected.
Highest district is West (.80).
Chaff Scale: 51% of groves infested (Norm 72%); 2% economic (Norm 15%).
Population is below normal and will continue in the low range; slight increase is
expected. Highest district is South (.71).
Yellow Scale: 66% of groves infested (Norm 64%); 1% economic (Norm 12%).
This scale is below normal abundance and is expected to remain low. Highest
district is South (.79).
lack. Scale: 41% of groves infested (Norm 30%); 8% economic (Norm 13%).
Population is near normal and still in the low range; however, there is much varia-
bility among districts. It appears that the summer increase will occur later than usual
in most areas. Highest districts are East (1.10) and Central (.76).
Snow Scale is expected to increase in June.
Whitefly: 66% of groves are infested with larvae, which is about normal for May.
Increase is expected to result in population near the high range by mid-June.
Me'alyb- is curre-:.ly at the normal low level but is expected to increase greatly in
June and develop moderate to heavy infestations in about 20% of groves.


Sr-ay Notes: If citrus rust mite
several pesticides are available:
benzilate 4 liquid, 2.5 pounds of
500 gals. Sulfur dust thoroughly
satisfactory control.
600 May -, 1968 WAS


is the only pest requiring control before mid-June,
25 pounds of wettable sulfur, 1.25 pint of chloro-
chlorobenzilate 25W or 0.5 pint of Nabac 5 liquid per
applied at 1 to 1.5 pounds per tree also should give


W. A. Simanton