The St. Charles herald. [volume] (Hahnville, La.) 1873-1993, 1917-12-22

! ible crops can be grown until INC
worms increase sufficiently to cause
damage, when another rotation Is nee
essary.
The following crops are largely or
entirely immune TO root-knot:
Barley Grasses (nearly alp
Beggarweed. Flor Millets nearly alb
ida Milo
Chufas Oats winter
Corn Peanut
Cowpea. Brabham Rye
COwpea, Iron Sorghum
Cowpea. Monetta Wheat
Grass, crab
Root-knot Increased by Most Varieties
of Cowpeas.
Such varieties of cowpeas as the
WhippoOrwill, Clay. Black. Unknown.
Red Ripper. New Era, and others are
so susceptible to root-knot that not
only are they seriously injured, but
the growing of them on nematode-in-
tested fields greatly increases the num-
Der of worms in the SOIL and conse-
quentiy the damage to subsequent cot
ton or other susceptible crops. 1t Is
common complaint of farmers in wilt
sections that the wilt is noticeably
more severe after crop of cowpeas
of variety which is susceptible to
root-knot. This Is due to the fact that
the nematodes make points of en-
trance for the wilt fungus, which then
kills or further Injuries the plants. A
few varieties of coyrnooc NO bi,rhl,, 900
s1stant to nematcdes, including the
Iron, Brabham, and Monetta. These
should be the only cowpeas planted on
land infested with root-knot.
How to Recognize Cotton Root. Knot.
The detection of cotton plants affect.
ed by root-knot, except by an exam
nation OF the roots, Is much more fiif.
flcult than In the case of wilt. Radlv
diseased plants are distinctly stunted
but not appreciably deformed, as in
wilt, and both leaves and stem have a
peculiar sickly yellowish green color.
Measures for the Control of Root.kno+
The rotation and diversifcatson ~
crops are of fundamental Importance
TO southern agriculture everywhere
ana become absolutely neeessaru
where the root-knot nematode is nres.
ent.
1t has been repeatedly demonstrated
by many farmers that root-knot con n
controlled by the use of proper crop
fota'iohs' The principles on which
such rotations are based are fr) the use
OF crops immune to nematode attacks
until the nematodes are suffieient,r re-
duced so that susceptible crons r,sr be
prohtably grown and (2) the eradica.
tlon OF all weeds subject to rootknot.
Inc use OF crops that will return
proht and the building up of the fer
'.'i's oi the soil are also important con-
slderations. Every farmer must work
oul lof nlmself the particular rotations
suited to his farm and his type of
farming
IL lana Is very badly infested with
hematodes as we'll as wilt two-year
or three-year rotation with immune
crops is recommended before suscepti.
Die crops, including cotton are grown.
anu they should not be grown for more
.hah one or two years thereafter be-
1ore the rotation with immune crops
should be repeated. When the infes-
eation Is less severe, a one year or two
year rotation will do much to put the
land In condition to grow the crops de-
sired.
In planning rotations for land i'm
1esteo with roos.knot, susceptible
crops such as tobacco sweet potatoes,
cotton, cantaloupes, okra, and toma-
toes should never follow one another.
Inc damage increases each year so
lohg as susceptible crops are planted
IL the first crop should escape serious
injury. the nematodes will increase in
the soil to such an extent that the sec
ond crop will be ..lmost sure to show
decided loss immune crops should
always be alternhtcd with susceptible
ones and the nenatode injury thereby
reduced to minimum.