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CES Mimeo Series 70-17
7 CITRUS EXPERIMENT STATION
LAKE ALFRED, FLORIDA
QUARTERLY CITRUS INSECT AND MITE OUTLOOK
CAUTIONARY NOTE: This Outlook is based on the assumption that weather beyond the
period of the current U.S. Weather Bureau 30-day Outlook will be normal. Therefore, the
forecasts given below cannot be viewed with the same degree of confidence as those in the
"Insect and Disease Summary" usually released twice each month by this Station.
Each pest has more or less regular periods of increase and decrease throughout the
year. Weather conditions (temperature, rain, humidity) may affect populations directly,
or indirectly through effects on predators, parasites and tree growth. Departures from
the average population level may be caused by conditions that occurred months before.
Other fluctuations may reflect recent weather changes. The latter influences can be
forecast only to the extent that weather forecasts are available.
RECENT SITUATION OCTOBER THROUGH DECEMBER 1969
Rust mite was again the pest of greatest concern to growers. Population was above
normal and at high level throughout the period. At the fall peak in mid-November, 62%
of groves harbored moderate or heavy infestations and mites were present on 22% of leaves
and on 22% of fruit.
Black scale was more abundant than normal during the period but was at moderate level
and not of wide importance. Whitefly populations in October and November were the highest
in 18 years of record for those months. Although whitefly was high for 7 weeks, little
damage resulted apparently due to plentiful rainfall which washed off secretions and pro-
moted vigorous foliage.
Snow scale was found in 24% of survey groves in November and population was higher
than in any prior month. A slight decrease occurred in December. Green scale, plant
bugs and brevipalpus mite were more abundant than usual in the period but infestations
were light and of little importance.
Citrus red mite, Texas citrus mite, Glover scale, purple scale, yellow scale and
chaff scale were near or below normal levels and all were in the low range.
GENERAL FORECAST JANUARY THROUGH MARCH 1970
Rust Mite: Population is expected to continue at moderate to high level through
February then decrease briefly in March. About 25% of groves will have heavy infestations.
Texas Citrus Mite: Although slight increase is expected, population will remain low.
Heavy infestations are predicted for about 5% of groves.
Citrus Red Mite: Gradual increase is expected, but population will not exceed the
normal low level for the period. About 8% of groves will harbor heavy infestations.
Six-spotted Mite: Light infestations will occur on inside leaves in about 3% of
groves in February. Heavy infestations, capable of causing leaf drop may be expected
to develop in 1% of groves.
Glover Scale: Nearly all groves will harbor light to moderate infestations.
Little change in population is expected.
Purple scale and chaff scale will be present as light infestations in a majority of
groves. Although a slight increase is likely, neither scale is expected to become
important through March. -
Yellow scale population will remain at a moderate level. Scattered groves, and
especially young trees, may develop important infestations in March.
Snow scale population is expected to be greater than a year ago. It will expand
and intensify in March.
Aphids are expected to appear on new growth in late February and increase rapidly
through March to a peak about mid-April.
THE NEXT CITRUS INSECT AND DISEASE SUMMARY WILL BE MAILED EARLY IN FEBRUARY
600 January 16, 1970 WAS
W. A. Simanton