Compendium of Potato Diseases - (PDF, 101 mb) - USAID

nm), which do code for coat protein synthesis (Fig. 85C).
Protein-coated
noltUm on tins+ long particiles and short of rods hoth are lengths. produced ManlV on 1 strains %'lcitlhe of
I RV are known and illOCILIII paricle may i e COI~fiWbth of differentiated lngth. surologicall. Man'v trais OfCuIL
Isolationti Of I RV from potato is ustl Ujl difficult, and
diflicult increases \ ith time after har\ est. IR V is isolated from
soil b mechanically inoculating leaves oftest plants with roots
of hailt plants (tobacco Or ciucunber triturated in buffer,
Epidemiology
Incidence Of spraing is liglcst ill Sandy ',oils. I\e le species
of sttubh \ tomll u nr ~itide ( Trich/ro r s or -Iaratr/icodorusl
transm it I RV: io \c\c . riot ill f these feed oil potato.
od-i rU. sPp. gcnerallI Icc- ill sands, opeln-textured soils
and ha.\e been found at depths of 8f0- 100 cm. Populations of'
"'iulh:,ori.% hac renlfiaied inftcti\c in moist soil ma rintained in
the lhoirator\ lfo as long as like \Cars in tie absence Of athost.
I lie \ iruns is not retained throughfilt egg Or the molt.
Priimar\ tuber infect ion follows inemathodes feeding directly
oi uhers. Ssfsernic rnfectioin Oiftubers fromi rioot feeding sites
has not beeun deonoi rated. . slt\nfrtile m CitClt o01"R N occurs
iost olien l 21-25 '' and is sometimes enhanced by pruning.
A, hliugh tile discase can he transrmitted through seed tubers,
transmiussuion in this minriner is infrequent, and te virus is
iuhltiniatcls sel-eitiiatil. Nuns iruilicroLus populatiorns of tile
Irihiul,rol rilrll\ acquire the \iri, frot infected potato
plirits. and tuher dissCmililation Of I RNV from infected to virus-
Irce ficlds has not been deinonrstated. Opinions differ as to tile
irrrpiOr ltaiC,(f tulbetr disserinatir. I lic \irus can be SeedrIrIlI'rniid
iii fhosts.
other Mo\ement iif sioil infested \with
k i hlferoti,s ltierialodcs is priibaihl. t. liost effective nleans if
if isse iiiinil i .
Other losts
I 10 can infect inore thran 400 ninocotyledonous and
LlnCOr\ ledilorUS spcies in user 51) ~airrilies. Often it does trot
hconlc ssstrlnlic. re-rlainrill in otlls iof plants that Show' no
foliage s\ tritorris.
In ( ]t tt;'v oiiudm amaranicolor,t lie si rils prod rices necrotic
local lesions. soie spreading, bit the sirus is not systernic. I lie
hist Is used for diagnosis indf for local lesion assay.
In ( iil lim iis.,.i 'l hilorotic or Iccrotic local lesions occuir.
I his is i diagnrostic houst, used for local lesiion assay, and is a
go id hait pla tt Is roots become infected from nemalode
feed i itu.
11 .irofiall'i' ch'elandii.inoiculated lea\ es are sVmptonless
or lia\e ehirtotie ir necrotic lesions. Systenicalis infected
Iea\e,, ts'\clp e\\ syvniptltois orr variable ailnounts of necrotic
flecing and distortion. I his is a diagnostic host, alsi used for
increasii g 5iris titer.
Necrotic loc-ral lcsions are formed Onl Phl.u ,olux vnaris ill one
o thrCC d;1\s. Ilie diseise is iot s\stelenic.
V tata