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Rahmlow, H. J. (ed.) / Wisconsin horticulture
Vol. XXX (September 1939/July-August 1940)

Wisconsin horticulture, vol. 30, no. 7: March, 1940,   pp. [177]-208

Page 194

                    By the * 
Chester Harrison, Waldo, President 
Dr. Geo. Scheer, Sheboygan, Vice-President 
H. J. Rahmlow, Madison, Cor. Sec. 
     Otto Kapschitzke, Rec. Sec.-Treas.    Fred Hagedorn, Sheboygan 
     1710 Illinois Ave., Shieboygan 
         R710glinonal Avle..uldsnta mEdwin Ristow, Oshkosh 
         Rean ional VicevPresMntR 
     Frank Blood, Stevens Point  Ben Robinson, Kenosha 
Gladiolus Thrip Control 
                                Noel Thompson 
T may not be true, as is some- 
   times reported, that cats, es- 
pecially alley cats, have nine 
lives. And of course, it is not a 
fact that Gladiolus thrips have 
three lives. However, since many 
treatments for this pest are said 
to be 100% effective and yet fail 
for one reason or another it may 
be best to suppose that the thrips 
has three lives and therefore 
needs to be "killed" three times. 
One good grower of my acquaint- 
ance "kills" his thrips five times, 
but this, I think, may not be 
    How to Use Naphthalene 
  No doubt all of you have elimi- 
nated all thrips from your corms 
by storing them at a temperature 
of 450 or less for the last several 
months. This is a safe method, 
and I am convinced, will kill all 
thrips. You  should also have 
killed them by fumigation. Naph- 
thalene flakes are most common- 
ly used for this. If you used this 
material, you can be sure all the 
thrips are dead again. It is now 
time to make sure that you do 
not also kill the corms. The 
greater part of the flakes should 
be removed from the corms and 
ventilation increased before there 
is any possibility of root growth. 
Naphthalene flakes seldom injure 
dormant corms but may injure 
them in the fall or in the spring 
when they are breaking dorm- 
ancy. Therefore, now is a good 
time to remove most of the 
        Final Treatment 
  So far, we have only "killed" 
the thrips twice this winter. To 
make sure that they are dead, 
soak the corms in a solution of 
Bichloride of Mercury, one part 
by weight to 1,000 parts of water. 
This should be for 12 hours or 
more and is usually done just be- 
fore planting. Do not use metal 
containers. Enameled or glass 
containers are best. With small 
lots, fruit jars are convenient. 
With larger lots, crocks may be 
used, or wooden barrels. It is 
best to use a fresh solution for 
each successive treatment. Treat 
all your glads, cormels as well 
as corms, and do not put the 
treated ones back near the un- 
treated. Then burn everything 
that is left. If this is done care- 
fully, you should be able to kill 
the thrips for the third time. 
Treat Purchased Corms Again 
  Don't neglect the corms you 
bought this winter. Probably all 
the thrips on them were "killed" 
once by the grower, but be sure 
you kill them again before plant- 
ing. These corms should be soak- 
ed in the Bichloride solution 
along with your own. It might 
also be well to assist your neigh- 
bor in treating his corms. 
     Manitowoc, arranged for a 
meeting  of gladiolus fans in 
Manitowoc on March 8th. At a 
previous get-together meeting, 
ten members signed up to or- 
ganize a Chapter, and about 25 
members signed up at the meet- 
ing on March 8th. 
  Fine work Manitowoc! Now 
let's organize more Chapters in 
other cities. 
  The Sheboygan Chapter held a 
meeting at Waldo on February 
22nd. Thirty-nine attended. The 
slides of the Wisconsin Horticul- 
tural Society on gladiolus and an- 
nuals and perennials were shown. 
  At the Waldo meeting grow- 
ers donated bulbs which were 
sold at auction resulting in the 
sum of $18.00 for the treasury. 
    Hartford, Municipal 
    Sunday, March 31 
    10 A.M.-4 P.M. 
    -Good Program-- 
March, 1940 

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