Abstract
Field studies were conducted in 1993 and 1994 to evaluate the effects of induced resistance in cucumber by plant growth-promoting rhizobacteria (PGPR) on numbers of the spotted cucumber beetle, Diabrotica undecimpunctata howardi Barber, and the striped cucumber beetle, Acalymma vittatum (F.). Cucumber plant growth and yields were significantly (P <0.05) greater, and populations of cucumber beetles were significantly lower, on PGPR-treated cucumber than on nontreated cucumber. On dates when peak beetle populations were present, PGPR treatment resulted in significantly(P<0.05) greater cucumber beetle control than weekly applications of esfenvalerate insecticide. In no-choice greenhouse cage e:periments with 3 cucumber cultivars, beetles infected with the cucurbit wilt pathogen, Erwinia tracheiplila, were released and allowed to feed on PGPR-treated or nontreated cucumber plants. The incidence of cucurbit wilt disease was significantly(P <0.05) lower on PGPR-treated cucumber plants than on nontreated plants. These results indicate that PGPR-induced resistance may be more effective than insecticides for control of cucumber beetles and cucurbit wilt disease on cucumber. Possible mechanisms for PGPR-induced resistance against cucumber beetles are discussed.
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Claims 4
Claim · model-written summary
PGPR treatment increased cucumber plant growth and yields.
- Taxon
- Cucumber
Cucumis sativuse1 - Treatment
- PGPR-treatede1
- Outcome
- plant growth and yieldse1
- Direction
- greatere1
- Comparator
- nontreated cucumbere1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Cucumber plant growth and yields were significantly (P <0.05) greater, and populations of cucumber beetles were significantly lower, on PGPR-treated cucumber than on nontreated cucumber”
Claim · model-written summary
Populations of cucumber beetles were lower on PGPR-treated cucumber than on nontreated cucumber.
- Taxon
- CucumberCucumis sativuse1
- Treatment
- PGPR-treatede1
- Interactor
- cucumber beetlese1pest
- Outcome
- populations of cucumber beetlese1
- Direction
- lowere1
- Comparator
- nontreated cucumbere1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Cucumber plant growth and yields were significantly (P <0.05) greater, and populations of cucumber beetles were significantly lower, on PGPR-treated cucumber than on nontreated cucumber”
Claim · model-written summary
PGPR treatment gave greater cucumber beetle control than weekly esfenvalerate insecticide on dates of peak beetle populations.
- Taxon
- CucumberCucumis sativuse1
- Treatment
- PGPR treatmente2
- Interactor
- cucumber beetlee2pest
- Outcome
- cucumber beetle controle2
- Direction
- greatere2
- Comparator
- weekly applications of esfenvalerate insecticidee2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Cucumber plant growth and yields were significantly (P <0.05) greater, and populations of cucumber beetles were significantly lower, on PGPR-treated cucumber than on nontreated cucumber”
e2“On dates when peak beetle populations were present, PGPR treatment resulted in significantly(P<0.05) greater cucumber beetle control than weekly applications of esfenvalerate insecticide”
Claim · model-written summary
The incidence of cucurbit wilt disease was lower on PGPR-treated cucumber plants than on nontreated plants in no-choice cages.
- Taxon
- CucumberCucumis sativuse1
- Treatment
- PGPR-treatede3
- Interactor
- Erwinia tracheiplilae3pathogen
- Second interactor
- beetlesColeopterae3pest
- Outcome
- incidence of cucurbit wilt diseasee3
- Direction
- lowere3
- Comparator
- nontreated plantse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Cucumber plant growth and yields were significantly (P <0.05) greater, and populations of cucumber beetles were significantly lower, on PGPR-treated cucumber than on nontreated cucumber”
e3“beetles infected with the cucurbit wilt pathogen, Erwinia tracheiplila, were released and allowed to feed on PGPR-treated or nontreated cucumber plants. The incidence of cucurbit wilt disease was significantly(P <0.05) lower on PGPR-treated cucumber plants than on nontreated plants”
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