CITRUS EXPERIMENT STATION
LAKE ALFRED, FLORIDA


CES Mimeo Series 68-32


CITRUS INSECT AND DISEASE SUMMARY
MID-JUNE 1968


Statewide Index of Abundance


EAd
May


Mid
June


Trend
Rust mite


Rust mite .. fruit
leaves -

^-- ----^_^


s C.
Texas C. mite


-2.C




-1.5




-l.(


-0.5


High for
mites


U? r, ;nrv


scales


End
May


Mid
June


Black
Scale


i
Trend

/
/
/


/ .> Glover
S-- Scale


S, Whitefly larvae
!/ Whitefly larvae


NOTE: Only pests or conditions of general or current interest are reported.
Forecasts are for 1 month in advance unless otherwise indicated.


Rust Mite on Leaves: 67% of groves infested (Norm
on Fruit: 60% of groves infested (Norm
Population is above normal and at high level.
population will continue in or near the high range.
West (1.83) South (1.80) and East (1.45).


40%); 52% economic (Norm 21%).
37%); 42% economic (Norm 17%).
Although temporary decrease is
Highest districts are Central


Texas Citrus Mite: 79% of groves infested (Norm 67%); 49% economic (Norm 45%).
Population is approaching the summer peak and is near the normal level for June.
Decrease is expected in July. Highest districts are Central (2.08) South (1.75) and
West (1.47).
Citrus Red Mite: 59% of groves infested (Norm 64%); 22% economic (Norm 41%).
Population is below normal and in the moderate range as it approaches the summer peak.
Slight decrease is expected. Highest districts are North (1.04) and East (1.00).
Glover Scale: 88% of groves infested (Norm 86%); 20% economic (Norm 32%).
Population is expected to remain in the high range through July but below the normal
summer level. Highest districts are East (1.50) South (1.29) and Central (1.00).


Purple Scale:
Chaff Scale:
Yellow Scale:


67% of groves
50% of groves
72% of groves


infested; 1%
infested; 1%
infested; 1%


economic:
economic:
economic:


These 3 scale species are much be-
low the levels of recent years and
are not likely to'develop heavy
infestations in any district.


Black Scale: 73% of groves infested (Norm 68%); 45% economic (Norm 49%).
Population has increased greatly and is at the normal high level for June. Further
increase is expected to keep population above normal and in the high range through July.
All districts are high: East (1.86) Central (1.74) South (1.25) North (1.22) and
West (1.19).
Snow Scale: 16% of groves infested; 4% with moderate or heavy infestations. Increase
is expected.
Mealybug; 64% of groves infested; 1% economic. Population will increase and will ap-
proach the high range. It is expected to remain below the summer peak levels of the
past 4 years. Few infestations will be important.
Whitefly: 65% of groves infested; 27% economic. Population of the larval form has en-
tered the high range and is expected to remain near the current high level which is normal
for June.
Melanose infection of leaves in May was the lowest recorded in 17 years of record.
Spray Notes: To give a long-lasting effect, the summer spray should .be thorough, even if
the pests are not abundant at the time of application. Users of concentrate sprays should
check lheir mixture against the recommended amounts of pesticide per acre and per tree
based on the diluce rate. Then make sure the spray is uniformly dispersed throughout the
tree. Some growers are applying too little pesticide to do the job.


600 June 24, 1968 WAS


C- -

C. red mite


expected,
(2.00)


W. A. Simanton


r ..9


0


0