Gladiolus thrips

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Material Information

Title:
Gladiolus thrips
Physical Description:
Mixed Material
Creator:
Benson, Mary F
United States -- Bureau of Entomology and Plant Quarantine
Publisher:
Bureau of Entomology and Plant Quarantine, U.S. Dept. of Agriculture ( Washington, D.C. )
Publication Date:

Record Information

Rights Management:
All applicable rights reserved by the source institution and holding location.
Resource Identifier:
aleph - 030256053
oclc - 86173749
System ID:
AA00017514:00001


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Full Text
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GLADIOLUS THRIPS


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MARY F. BENSoN


a, Adult thrips; b, egg; c, larva; d, pupa (or resting stage); e, foliage
and flower spike showing typical feeding injury; f, uninjured gladi-
olus corm; g, corms injured by feeding of thrips, showing charac-
teristic russeted appearance. (a, b, c, and d about 20 times natural
size; e, f, and g about one-half natural size.)

(See other side for life history and control)

Bureau of Fnt.rm-ilrIv AnJ Plant Quarantine
UL'nitcd Statea Depar'rment of Agriculture Picture Sheet No. 6


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GLADIOLUS THRIPS
(Taeniothrips simplex Mor.)

Life History
The gladiolus thrips overwinters on tlih stored( corms, where feed-
ingL aid i1repro auctionn are continuous as long as tlihe temperature is
.ilhove 50 F. During the growing season the foliage and flowers of
the growing p1laint are attacked. The eggs are inserted in the plant
tissue. Under favorable conditions a generation of the thrips may be
completed in 2 weeks or less. The larvae and adults are responsible
for tlhe injury; no feeding occurs in the pupal stage.

Control
This thrips is subject to chemical control, either on the stored
corms or on the growing plants. Very often both types of control
measures may be ,seld.
Control on the Corms
On dormant corms the thrips may be eliminated by the use of
naphthalene flakes. Apply the flakes at the rate of 1 ounce per 100
corms and leave them with the corms for 4 weeks at a temperature of
60 to 70 F. The corms may be contained in paper sacks, or in bulb
tra.ys or boxes cover(d(l with paper. Do not use naphthalene on non-
dormant corms. If late spring treatments are necessary, soak the
corms for 12 to 24 hours in a solution of 1 ounce of mercuric chloride
(corrosive sublimate) in 7S gallons of water, in an earthenware or
wooden container.
Control on the Plants
The growing plants should be watched for evidence of thrips
feed(ling; and if such feeding is noted, spraying should be begun at
once and continued at weekly intervals until flowering. If infested
pIlants are not sprayed until blooming, the flowers cannot be saved.
The spray should be applied as a fine mist, and( an effort made to
avoid lrun-off.

The recommended spray combination is as follows:
Small Large
q mtifin il e qua entities
Ira ar (iet.........................-------------------------------- 1 ouincc. 2 pounds.
Brow ii tvar..-...............-..-.----------------- 2 ounllces. 4 pounds.
Waler ..- --... -....--....-.......--......--.---.--------.. 3 gallons. 100 gallons.
It', -l)7 li l)
UNIVERSITY OF FLORIDA
1Iii1 1 U If11 I ll I 11111 111I I I IA I
3 1262 09082 4649
April 1911 I'. S. Government Printing Office
Fr -a;lh 1Y) tlie Sup-rintendvieit of Documenlis, Wasliiiiton, 1)D. C.- Price 5 cents




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