The Emmett index. [volume] (Emmett, Idaho) 1893-1925, 1919-12-18
William Stuart Of the United States
Department Of Agriculture.

Jhi~~ VA sJR~B - ~ w. ~--e
, Of any given variety, are essentially
as detrimental to successful potato
, production As mixtures Of varieties, no
: stock shall be certified or planted with
the expectation Of producing for GER
LITIGATION that are not uniformly typ
zeal in all characteristics for that par
ticular variety in the district where
it is grown.
Pests and Diseases that DisGuaIify.
4 No potatoes shall be certified that
show by inspection on vine or tuber
the presence Of the diseases known as
black wart (Chrysophlyctis endobio-
tica Schilbj, powdery scab (Spongos-
pora subterranea WaIlr), and violet
rhizoctonia (Rhizoctonia crocorum) /,
and the pests eelworm (Heterodera
radicicola Greet. MuD and potato tu-
Der moth (Phythorinaea operculella
Zeller).
Limitations Of Other Infections.
Scab--No potatoes shall be certified
which show upon the tuber at final in
spection more than per cent scab
(Actinomyces scabies Thaxt,), with
no deep scab pustules permissible.
Rhizoctonia BLACK scurf) -More
than ~ per cent shall disqualify ard
no seurf spot larger than one-eighth
inch in diameter shall be permitted.
Vascular Infsetion--Not to exceed
per cent Of the tubers, as determined
by transverse sections Of stem end
Of tuber in the final tuber inspection
shall be permitted. Vascular infec-
ton shall be interpreted as meaning
wilt diseases as Fusarium oxysnorum
(Schlecht), Verticillium alboatrum
(Rein e. Berk), Bacillus phytopho-
thorus (Appel) ct al.
Late Blight-Not to exceed per
cent of the tubers infected with late |
blight rot spots, and no spot to exceed
one-half inch.
Regulations Governing Vine Inspec-
tions.
Inspection of potatoes is not only
necessary after the crop is harvested,
but also during the growing season
to determine trueness to type and va
riety, and freedom from disease. This
shall be accomplished by an insp ection
OF the potato plants in the field at
blooming time, and again just prior
to maturity of the plant.
Bloom Time Inspection.
Variety-More than per cent va
rietal mixture at this inspection shall
for certifcation. Further
more, variation in type Of plants in
excess of 10 per cent, indicating de-
generate or inferior strains Of vari-
ETY., shall disqualify for certification.
Diseases-More than 10 per cent Of
the plants at this inspection affected
by the following diseases or more than
5 per cent affected by any one of the
groups Of diseases shall dis
qualify the field for certification: ;
l. Well defined curly dwarf, leaf
roll, mosaic, or other inherited weak
nesses, combined
2. Wilt diseases and blackleg COM
oined.
3. Rhizoctonia BLACK scurD. I
Immediately following the bloom I
line inspection all diseased or objec- I
ionable plants must be rogued.
Second Plant Inspection.
At this inspection the tolerances
governing certification shall be: Not
o exceed per cent of mosaic, curly
Iwarf, leaf-roll and other inherited
not to exceed per cent
+ diseased plants from any one of
he following diseases-wilt, blackleg,
nd rhizoetonia--nor a total of per
ent of diseased plants from these
hree causes. Rogueing of the field Z
must again follow the second plant in
pection. II 10 per cent or more of.
he vines show serious infection of
ate blight, the field shall be disquah-
ed for certification. The uniformity
nd quality of the product as seed e
hall be determined at the second in 2
pection, at which time not to exceed 3
per cent of the hills shall each
leigh less than 80 per cent of the av-
rage of 100 consecutive hills.
Final Tuber Inspection.
This inspection shall be after har- t
est and after final grading for the
eed market and shall conform to the r
onditions as hereinbefore specified e
Certificate of Inspection. r
A form Of certificate for certifying =
sed potatoes shall be furnished the -
rover.
The CertifcatiOn Tag.
There shall be attached to each bag Y
: container Of certified seed eertif- ~
.tion tag, stating thereon that the r.
= = Il