Title: Chemical control of the Cuban laurel thrips
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Title: Chemical control of the Cuban laurel thrips
Physical Description: Book
Creator: Reinert, James Arnold,
Publisher: Agricultural Research Center, IFAS, University of Florida
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Bibliographic ID: UF00076434
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Source Institution: University of Florida
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University of Florida IFAS
Ft. Lauderdale ARC Research Report FL-77-4


CHEMICAL CONTROL OF THE CUBAN LAUR LIBRARY

AUG 14 1978
James A. Reinert
University of Florida, ARC, I1AS
Ft. Lauderdale, Fla. .S.Univ. of Forida
February 23, 1977


Cuban laurel thrips, Gynaikothrips ficorum (Marchal), were first

reported in Florida in 1887. They are found throughout the tropics,

appearing wherever Ficus retusa is planted, and in the United States

they are recorded from California, Florida, Hawaii, and Texas.

Feeding of adult thrips on a tender light-green'leaf is initially

marked by sunken reddish spots along the midrib. Tight curling of the

leaf is caused by development of colonies of immature thrips. As the

nymphs mature, the tight curled leaf becomes hard and tough, then gradu-

ally yellow and brown. This thrips appears to be host specific on F.

retusa and when they become abundant on this host, they tend to cause

leaf deformation and defoliation of all the new leaves.

MATERIALS AND METHODS

F. retusa plants ca 1.5 m tall growing in 30.5 cm diam plastic con-

tainers with nearly equal Cuban laurel thrips populations were selected.

Six to 8 infested terminal leaves were randomly selected on each plant, and

the average thrips population per leaf was determined. Plants were then

divided into 4 replicates, for two separate experiments, based on the thrips

populations, and treatments were randomly assigned within replicates.








Research Report FL-77-4
Page 2 continued


Tables 1 and 2 give the 20 insecticidal treatments and rates applied.

Insecticides evaluated-which do not have accepted common names included the

following:

CGA-12223, 0,0-diethyl-0-(5-chloro-l-ios=propyl-l,2,4-
triazol-3-yl)-phosphorothioate;

SD-43775, Benzeneactic acid, 4-chloro-alpha-(1-methylethyl)-
cyano(3-phenoxyphenyl) methyl ester;

TH-6040, l-.(4-chlorophenyl)-3-(2,6-difluorobenzoyl) -urea;
and

Vel-3883, 5-dimethylamino-l,2,3-trithiane-hydroxalate.

All the chemicals were mixed with water and applied with a 7.6 liter compressed

air sprayer. Treatments were applied in:March and April,._1976.when adults were

emerging and swarming on the experimental plants. In each experiment, plants

were examined at weekly intervals after treatments were applied. Results were

compared statistically by Duncan's multiple range test.

RESULTS AND DISCUSSION

Results of the 2 experiments are given -in Tables 1 and 2. All of the

Evaluated insecticide or insecticidal combinations provided significant con-

trol by 1 week post application. In experiment 1 (Table 1), most of the

insecticides were effective for several weeks following treatments but only

oxamyl provided significant control up to 6 weeks; -In experiment 2 (Table 2),

all treatments except diazinon and SD-43775 provided significant control for

up to 3 weeks. In the'second experiment, populations on the check trees had

dropped significantly at 3 weeks posttreatment because the populations had

reached the imago stage and dispersed among the experimental plants. A rein-

festation was not as evident in the second experiment as had been shown at 6

weeks posttreatment in the first experiment.





















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