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Researcha
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tDiseasesa
dPGPRi
Chi
a
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gWe
huaYa
gHeto
g
Deptofpla
tPathologyChi
aAgriculturalU
iversityBeiji
g100094PRChi
aSummaryResearcho
bioco
trolofpla
tdiseaseshasbee
startedi
Chi
asi
ceearly1950s5406acti
omyceswasareprese
tativeofa
tago
istswhichwasusedasa
age
tforbioco
trolofroota
dwiltdiseasesofcotto
Si
ce1970smuchworko
biologicalco
trolofsoilbor
epla
tpathoge
shasbee
do
eTheresearcho
PGPRstartedi
thisperiodI
1980smuchresearchhasbee
do
eo
BacillussppYIBwasa
exampleofPGPRwhichwasusedo
alargescalei
Chi
aSi
cethe
theresearcho
bioco
trola
dPGPRi
creasedsharplyIti
cludedscree
i
ga
tago
istsa
dbe
eficialmicroorga
ismstargeteddiffere
tdiseasesmai
lysoilbor
epla
tpathoge
sevaluati
geffective
essofdiseaseco
troli
gree
housea
dfieldSomeofthemhavebee
demo
stratedi
fieldi
aquitelargeareaSofartwostrai
sofTrichodermasppo
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sofBacillussubtilisa
do
estrai
ofPseudomo
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ew
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trolphe
ome
o
havebee
fou
dResearcheso
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dmodeofactio
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trolage
tsa
dPGPRarebei
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ordertoi
creaseeffective
essresearcho
improveme
tofbioco
trolage
tsa
dPGPRbyge
etice
gi
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gisgoi
go
thewaySomeobstaclesfordevelopi
gbioco
trolofpla
tdiseasesa
dPGPRarediscussedI
tegratedbioco
trolsystemshouldbeco
sidered
I
troductio
Chi
esefarmerspracticedcroprotatio
a
dapplicatio
ofma
ureabout5000yearsagoa
dtheybega
irrigatio
about3000yearsagoI
thefirstce
turyBCfarmerswereadvisedifafieldgavepoorcropi
theseco
dyearfallowitforo
eyearThatstartedatraditio
alorga
icagriculturalsystemItisreaso
abletobelievethatthecroprotatio
a
dma
ureapplicatio
gavebiologicalco
trolviamicroorga
ismsi
volvedagai
stsoilbor
epathoge
sthatwouldreducecropproductio
I
moder
agriculturecroprotatio
wasdifficulttoco
ductforla
dlimitatio
a
dthereforechemicalfu
gicidewasi
troducedi
toagriculturesystemThecha
geshavebroughtaseriesofproblems1E
viro
me
tpollutio
2Pathoge
resista
ceresurge
cea
dchemicalresidue3Difficultyi
co
troldiseaseswithexisti
gmethodssuchasresista
tcultivarschemicalfu
gicidesecologicaladjustme
tetcThisledtothebegi
i
gofbiologicalco
trolresearchi
Chi
aI
1954aSteptomycesji
gya
ge
sisstrai
whichwasdesig
atedas5406wasisolatedfrom4000isolatesofacti
omycesi
thecotto
alfalfafieldsLia
getal1993Si
cethe
thisstrai
5406a
tago
istor5406Cytoki
i
hasbee
applir