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A Systems Approach to Soilborne Pathogen Management of Hemp and Tomato
A Systems Approach to Soilborne Pathogen Management of Hemp and Tomato
A Systems Approach to Soilborne Pathogen Management of Hemp and Tomato

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자료유형  
 학위논문 서양
최종처리일시  
20260202105638
ISBN  
9798273307971
DDC  
581
저자명  
McMullen, Patrick William.
서명/저자  
A Systems Approach to Soilborne Pathogen Management of Hemp and Tomato
발행사항  
[Sl] : Cornell University, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
163 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-07, Section: B.
주기사항  
Advisor: Smart, Christine.
학위논문주기  
Thesis (Ph.D.)--Cornell University, 2025.
초록/해제  
요약Fungal and oomycete soilborne pathogens cause crown rot, root rot, vascular wilt, damping-off, and fruit rot on many crops. Here, I study multiple angles of soilborne pathogens on hemp and tomato in an effort to enhance management strategies for growers and to better understand host characteristics leading to infection. Fusarium spp. and Pythium spp. can cause damping-off, leading to poor stand establishment in direct seeded hemp and reduced germination in the greenhouse. Fungicide seed treatments were evaluated in an inoculated greenhouse experiment and on direct-seeded fiber hemp in field experiments to determine whether they prevent damping-off, increase stand count, and impact yield. Seed treated with copper hydroxide products Ultim-ST and Americop, as well as phosphite-based Prudent 44 / Nutrol had greater stand counts three- and sixweeks post-planting, but no significant differences were observed at harvest. The seed treatments did not significantly increase the percentage of healthy seedlings when inoculated with Pythium myriotylum or Pythium ultimum. I additionally evaluated whether biostimulants can enhance hemp growth under reduced nitrogen (N) fertigation. First, a gradient of N fertility rates was first evaluated. Hemp displayed N deficiency symptoms when fertigated with 53 ppm N and maximum growth was observed at 263 ppm N. Hemp treated with Double Nickel LC or RootShield Plus WP had no significant differences in height, biomass, or leaf SPAD values compared to nontreated hemp when fertigated with either 53 or 263 ppm N. In a separate set of experiments, the impact of disrupting expression of cutin related genes CUTIN SYNTHASE 1 (CUS1) and CUTICLE DESTRUCTING FACTOR 1 (CDEF1) in tomato was studied on the host's susceptibility to Phytophthora fruit rot. Significantly larger lesion sizes were recorded on cus1 and cus1xcdef1 mutant fruit inoculated with Phytophthora capsici than inoculated 'M82' WT and cdef1 mutant fruit. Microscopy provided evidence of faster cuticle penetration by P. capsici in cus1 fruit. The results of these studies are intended to inform disease management and direct future studies in understanding pathogen colonization in relation to cuticle formation.
일반주제명  
Plant pathology
일반주제명  
Horticulture
일반주제명  
Microbiology
키워드  
Biostimulants
키워드  
Phytophthora capsici
키워드  
Pythium myriotylum
키워드  
Seed treatment
키워드  
Tomato
기타저자  
Cornell University Plant Pathology and Plant-Microbe Biology
기본자료저록  
Dissertations Abstracts International. 87-07B.
전자적 위치 및 접속  
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MARC

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■006m          o    d                
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■020    ▼a9798273307971
■035    ▼a(MiAaPQ)AAI32395731
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a581
■1001  ▼aMcMullen,  Patrick  William.
■24512▼aA  Systems  Approach  to  Soilborne  Pathogen  Management  of  Hemp  and  Tomato
■260    ▼a[Sl]▼bCornell  University▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a163  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-07,  Section:  B.
■500    ▼aAdvisor:  Smart,  Christine.
■5021  ▼aThesis  (Ph.D.)--Cornell  University,  2025.
■520    ▼aFungal  and  oomycete  soilborne  pathogens  cause  crown  rot,  root  rot,  vascular  wilt,  damping-off,  and  fruit  rot  on  many  crops.  Here,  I  study  multiple  angles  of  soilborne  pathogens  on  hemp  and  tomato  in  an  effort  to  enhance  management  strategies  for  growers  and  to  better  understand  host  characteristics  leading  to  infection.  Fusarium  spp.  and  Pythium  spp.  can  cause  damping-off,  leading  to  poor  stand  establishment  in  direct  seeded  hemp  and  reduced  germination  in  the  greenhouse.  Fungicide  seed  treatments  were  evaluated  in  an  inoculated  greenhouse  experiment  and  on  direct-seeded  fiber  hemp  in  field  experiments  to  determine  whether  they  prevent  damping-off,  increase  stand  count,  and  impact  yield.  Seed  treated  with  copper  hydroxide  products  Ultim-ST  and  Americop,  as  well  as  phosphite-based  Prudent  44  /  Nutrol  had  greater  stand  counts  three-  and  sixweeks  post-planting,  but  no  significant  differences  were  observed  at  harvest.  The  seed  treatments  did  not  significantly  increase  the  percentage  of  healthy  seedlings  when  inoculated  with  Pythium  myriotylum  or  Pythium  ultimum.  I  additionally  evaluated  whether  biostimulants  can  enhance  hemp  growth  under  reduced  nitrogen  (N)  fertigation.  First,  a  gradient  of  N  fertility  rates  was  first  evaluated.  Hemp  displayed  N  deficiency  symptoms  when  fertigated  with  53  ppm  N  and  maximum  growth  was  observed  at  263  ppm  N.  Hemp  treated  with  Double  Nickel  LC  or  RootShield  Plus  WP  had  no  significant  differences  in  height,  biomass,  or  leaf  SPAD  values  compared  to  nontreated  hemp  when  fertigated  with  either  53  or  263  ppm  N.  In  a  separate  set  of  experiments,  the  impact  of  disrupting  expression  of  cutin  related  genes  CUTIN  SYNTHASE  1  (CUS1)  and  CUTICLE  DESTRUCTING  FACTOR  1  (CDEF1)  in  tomato  was  studied  on  the  host's  susceptibility  to  Phytophthora  fruit  rot.  Significantly  larger  lesion  sizes  were  recorded  on  cus1  and  cus1xcdef1  mutant  fruit  inoculated  with  Phytophthora  capsici  than  inoculated  'M82'  WT  and  cdef1  mutant  fruit.  Microscopy  provided  evidence  of  faster  cuticle  penetration  by  P.  capsici  in  cus1  fruit.  The  results  of  these  studies  are  intended  to  inform  disease  management  and  direct  future  studies  in  understanding  pathogen  colonization  in  relation  to  cuticle  formation.
■590    ▼aSchool  code:  0058.
■650  4▼aPlant  pathology
■650  4▼aHorticulture
■650  4▼aMicrobiology
■653    ▼aBiostimulants
■653    ▼aPhytophthora  capsici
■653    ▼aPythium  myriotylum
■653    ▼aSeed  treatment
■653    ▼aTomato
■690    ▼a0480
■690    ▼a0471
■690    ▼a0410
■71020▼aCornell  University▼bPlant  Pathology  and  Plant-Microbe  Biology.
■7730  ▼tDissertations  Abstracts  International▼g87-07B.
■790    ▼a0058
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17360920▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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