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STANDARD VIEW MARC VIEW
CES Mimeo Series 67-15
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 E.S.S.A 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 JULY THROUGH SEPTEMBER 1966
Several citrus pests departed from their normal levels of abundance during the
period, but overall pest problems were not excessive.
Black scale continued to increase from its record high level in June and set
another record in July. At the mid-July peak 92% of groves were infested and 81% had
moderate or heavy infestations. Rapid decrease during August and September restored
population to the normal low levels for those months. Yellow scale decreased during
July from the record high level of June. It remained above average and in moderate
abundance in August and again increased in September. About 10% of groves had moderate
to heavy infestation. Glover scale was above normal abundance and at high level in
early July, then decreased through August to normal low level. Snow scale was above
average abundance and was important in scattered groves. Green scale, although scarce,
was more numerous than in prior years. Chaff scale, acuminate scale, brown soft scale,
cottony cushion scale, were below average abundance and all except chaff scale were
Rust mite increased above the normal high level in September when 51% of groves
harbored moderate or heavy infestations on fruit. Prevalence on leaves was slightly
less. Citrus red mite peaked at mid-July much below the usual high summer level.
Only 35% of groves harbored moderate or heavy infestations at that time. Population
decreased rapidly in August and was still below the normal low level for September.
Texas citrus mite also peaked at mid-July. It was near the normal high summer level
but by September population had decreased so low that mites were seldom encountered.
Whiteflies were generally below normal abundance during the period and were at
GENERAL FORECAST OCTOBER THROUGH DECEMBER 1966
Rust mite: Increase is expected October through mid-November followed by a
gradual decrease. Population will be at high level until early December with about
60% of groves having important infestations in the period.
Citrus red mite is expected to be moderately numerous through November with
scattered heavy infestations occurring until mid-December.
Texas citrus mite will be less common than citrus red mite and often will occur
in the same grove as the latter species. October and early November infestations
will be fewer and lighter than in recent years. Scattered heavy infestations are
expected mid-November through December.
Glover scale is not expected to depart from the current moderate level.
Yellow scale will fluctuate near the present moderate to high range.
Chaff scale will remain low and below average.
Whiteflies are expected to be near normal abundance and not of great importance.
650-October 20, 1966 WAS
W. A. Simanton