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S~ /' AGRICULTURAL RESEARCH AND EDUCATION CENTER Series 71-43
S7- 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 Center.
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 1971
Rust mite continued to be the major pest problem throughout the citrus belt.
Population increased to very high level in July and remained high and above normal
abundance despite a decrease in August and September. At the end of July 48% of groves,
not sprayed within the prior 30 days, harbored heavy infestations.
Texas citrus mite attained the summer peak early in July. It was above normal and
at a high level until mid-July then decreased rapidly to very low level by September.
In July, 42% of groves harbored heavy infestations. Citrus red mite entered July above
normal abundance. At that time 31% of groves were heavily infested. Decrease throughout
July and August resulted in only 3% heavy infestations by September and a normally low
Glover scale was the most numerous of the scale insects. It was near normal
abundance but remained in the high range only in early July, then decreased. Purple
scale was in a majority of groves as light infestations. Snow scale infestations
occurred in 28% of groves, with heavy infestations in 4%. Population at mid-September
was higher than in any prior month.
Black scale was in the high range most of the period but not high enough to be of
much importance. It was below normal in July and August and above normal in September
due to a retarded cycle of development.
Yellow scale, chaff scale and mealybug were at low level and below normal abundance
in July; then decreased to very low level through September.
Whitefly populations were slightly above normal July through September, and were
in the high range at the end of the period. Aphids were unusually abundant July through
September due to erratic flushes of new foliage growth. Infestations were widely
scattered and not of much importance.
Rainfall was normal only in the last week of July and the first 3 weeks of August.
Early July and the last half of September were very dry.
GENERAL FORECAST OCTOBER THROUGH DECEMBER 1971
Rust Mite: Population will continue in the high range through December with about
22% of groves developing heavy infestations. Increase will occur through November with
gradual decrease expected thereafter.
Citrus red mite and Texas citrus mite will increase through December. Although
population generally is predicted to remain in the low range, rapid increases may be
expected in young groves and heavy infestations are likely in 6% of groves.
Whiteflies will continue to be abundant through October, then decrease to moderate
Glover scale, purple scale, and yellow scale will slowly increase; however, none
are expected to occur in important numbers.
Black scale-pupumtartwTT il-cntinue to e above normal and at moderate level
through Novembe ; he4v[ ; lit 3 ~1Yill result this year. Snow scale will produce
crawlers until arlBa e temperatures slou their activity. Spread of infestation
to new areas is predicted due to crawlers being transported by picking crews.
Oi i i (
530 October 12 il 7A.SwUJniv. of Florida
W. A. Simanton