,Iff
VI


CITRUS EXPERIMENT STATION
LAKE ALFRED, FLORIDA


CITRUS INSECT AND DISEASE SUMMARY
END OF MAY 1968


Statewide Index of Abundance
-


Midi
May


Rust mite


ayd
May


Trend


e aves


Texas c mie
Texas c. mire-_!


A
C. red mite
C. red mite


SHigh for


mites

High for
scales


Mid
May


End
May


Trend


Glover
--- scale
--


..-- 7- Black
S" scale


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: 71% of groves infested (Norm 39%); 53% economic (Norm 23%).
Rust Mite on Fru-it:: 46% of groves infested (Norm 34%); 24% economic (Norm 17%).
Population is above normal and in the high range with further increase expected,
especially on fruit. Highest districts are Central (2.20) South (2.19) West (1.58) and
East (1.54). Heavy infestations will occur in all districts.

Texas Citrus Mite: 64% of groves infested (Norm 58%); 44% economic (Norm 37%).
Population is above normal and in the high range. Further buildup is expected until
July. Highest districts are South (1.80) Central (1.59) and West (1.36).


Citrus Red Mite: 54% of groves infested (Norm 57%); 26% economic (Norm 33%).
Population is below normal and is expected to remain in the moderate range.
tricts will have a few heavy infestations. Highest districts are East-(i.20) and
North (1.00).


Glover Scale: 84% of groves infested (Norm 84%); 16% economic (Norm 31%).
Population has entered the high range but is below normal due to lag in seasonal
buildup. Further increase is expected to keep population in the high range into July but
heavy infestations will be spotty. Highest districts are East (1.57) and South (1.15).


Purple Scale: 72% of groves infested (Norm 83%); 2% economic (Norm 14%).
Population is at a record low level for May and of little importance.
expected. Highest district is North (.86).


No change is


Chaff Scale: 51% of groves infested (Norm 73%); 29% economic (Norm 18%).
This scale is at a record low level for May and is expected to remain unimportant.


Yellow Scale: 70% of groves infested (Norm 65%); none economic (Norm
Population is below normal and currently in the moderate range.
will occur, infestations are expected to be lighter than usual in all
district is North (.75).


14%).
Although increase
districts. Highest


Black Scae: 50% of groves infested (Norm 47%)" 14% economic (Norm 28%).
Rapid increase will take populations into the high range in June. Numerous heavy
infestations are expected in all districts in July. Highest districts are East (1.14)
and Central (1.07).
Snow Scale: 16% of groves infested; 2% moderate to heavy. Increase is expected.
Mealybug: 38% of groves infested; 1% economic. Population is below average for May.
Increase is expected,

Whitef]y 57% of groves infested; 27% economic. Population is-above normal. Increase
is expected.
Sray Notes: Scale buildup is later and populations are lighter this June. Unless white-
fly, mr.alybug or black scale are numerous, it may be advisable to delay the summer spray
for better scale and greasy spot control. Rust mite should be controlled whenever it
threatens to become abundant.


600 June 3, 1968 WAS


CES Mime Series 68-30
CES Mimec Series 68-30


All dis-


=


,


W. A. Simanton