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STANDARD VIEW MARC VIEW
CES Mimeo Series 67-21
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.
REVIEW OCTOBER THROUGH DECEMBER 1966
The abundance of citrus pests during the period fluctuated within the limits normally
expected. Rust mite was the pest of most concern. Population reached high level early
in October, remained high and above normal through November, then subsided slightly
in December. Moderate or heavy infestations occurred in 41 to 54% of groves. Citrus
red mite increased in October and November to moderate level which held through December.
The 19% of groves with moderate to heavy infestations in December indicated the highest
December population since 1958. Texas citrus mite was very scarce and was much below
normal despite gradual increase throughout the period.
Yellow scale continued above average during the period, occurring as moderate to
heavy infestations in 11 to 17% of groves. Citrus snow scale, though still of scattered
occurrence, was found in more groves (8%) in December than in any prior month in 16 years
of record and infestations were heavier. Glover scale and purple scale gradually in-
creased to moderate level in November, and by December Glover scale was slightly above
normal abundance with moderate to heavy infestations in 10 to 14% of groves. Aphids
were more prevalent than normal in August through December. Black scale, chaff scale
and whitefly were below average abundance. No other citrus pests were unusually
abundant or noteworthy.
Rainfall was much below normal in most of the citrus belt except the east coast
from mid-October through mid-December. Relatively few trees showed water stress be-
cause soil moisture was adequate in most areas due to prior rains. No extremes of
GENERAL FORECAST JANUARY THROUGH MARCH
Rust mite: Population will decrease gradually until mid-March; then increase.
Mites will occur in normal moderate abundance during the period, but very few infesta-
tions will be destructive after January.
Citrus red mite: Population will decrease to normal low level after mid-January,
then continue low until late March when buildup will be evident on young trees in
Texas citrus mite: Slight increase is expected in January and again in late March.
Population will be low through the period and very few heavy infestations are expected.
Six-spotted mite is not expected to be present in destructive numbers through March.
Glover scale will be slightly more numerous than average and at moderate to high
Purple scale will continue at normal low to moderate abundance.
Yellow scale is expected to increase gradually and be more numerous than average.
Black scale will increase through January and then decrease. Although population
is expected to be in the low range, it will be higher than normal.
Snow scale infestations will spread and intensify.
Aohids will start to become abundant early in March.
650-January 9, 1967 WAS
W. A. Simanton