Abstract
Pepper plants showing general yellowing and white spots on the lower surface as well as brown spots on the upper surface of the lowest leaves were observed during the 1998 crop season in the states of Chihuahua, Zacatecas, and Aguascalientes (north central area of México). Light defoliation was observed. Samples were collected in Chihuahua and Zacatecas to identify the pathogen, which showed navicular conidia. A conidial suspension was sprayed on pepper varieties, but only Hungarian Yellow Wax showed powdery mildew lesions. The average size of the conidia from Zacatecas was 61.2 × 18.2 μm while those from Chihuahua measured 58.2 × 17.6 μm, which is coincident with the description given for an Oidiopsis sp. The perfect stage is Leveillula taurica (1). Cleistothecia were not observed. In Zacatecas the disease was not detected in tomato fields or in sowthistle (Sonchus oleraceae) plants contiguous to, or within, infected pepper fields. Powdery mildew incidence ranged from 35 to 80% in Ancho type and from 0 to 55% in Mirasol type pepper fields in Zacatecas. The number of powdery mildew lesions per leaf in most cases varied from 1 to 3. Incidence was higher in fields where the canopy was closed and warmer and wetter conditions may have allowed the disease to progress. Reference: (1) J. B. Jones et al. 1991. Compendium of Tomato Diseases. American Phytopathological Society, St. Paul, MN.
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Claims 10
Claim · model-written summary
Pepper plants showed general yellowing and white spots on the lower leaf surface in the 1998 season in Chihuahua, Zacatecas and Aguascalientes.
Verbatim
t0“Powdery Mildew of Pepper”
e1“Pepper plants showing general yellowing and white spots on the lower surface as well as brown spots on the upper surface of the lowest leaves were observed during the 1998 crop season in the states of Chihuahua, Zacatecas, and Aguascalientes”
Claim · model-written summary
Conidia from Zacatecas averaged 61.2 × 18.2 μm, coincident with an Oidiopsis sp. description.
Verbatim
t0“Powdery Mildew of Pepper”
e3“The average size of the conidia from Zacatecas was 61.2 × 18.2 μm while those from Chihuahua measured 58.2 × 17.6 μm”
e4“which is coincident with the description given for an Oidiopsis sp.”
Claim · model-written summary
Conidia from Chihuahua averaged 58.2 × 17.6 μm, coincident with an Oidiopsis sp. description.
Verbatim
t0“Powdery Mildew of Pepper”
e3“The average size of the conidia from Zacatecas was 61.2 × 18.2 μm while those from Chihuahua measured 58.2 × 17.6 μm”
e4“which is coincident with the description given for an Oidiopsis sp.”
Claim · model-written summary
Only the Hungarian Yellow Wax pepper variety showed powdery mildew lesions after conidial suspension was sprayed on pepper varieties.
- Taxon
- peppere6
- Material
- Hungarian Yellow Waxe6
- Treatment
- conidial suspensione6
- Outcome
- powdery mildew lesionse6
- Direction
- showede6
Not reportedComparator
Verbatim
e6“A conidial suspension was sprayed on pepper varieties, but only Hungarian Yellow Wax showed powdery mildew lesions”
Claim · model-written summary
Powdery mildew incidence in Ancho type pepper fields in Zacatecas ranged from 35 to 80%.
Verbatim
t0“Powdery Mildew of Pepper”
e7“Powdery mildew incidence ranged from 35 to 80% in Ancho type and from 0 to 55% in Mirasol type pepper fields in Zacatecas”
Claim · model-written summary
Powdery mildew incidence in Mirasol type pepper fields in Zacatecas ranged from 0 to 55%.
Verbatim
t0“Powdery Mildew of Pepper”
e7“Powdery mildew incidence ranged from 35 to 80% in Ancho type and from 0 to 55% in Mirasol type pepper fields in Zacatecas”
Claim · model-written summary
Powdery mildew lesions per leaf in most cases varied from 1 to 3.
Verbatim
t0“Powdery Mildew of Pepper”
e0“The number of powdery mildew lesions per leaf in most cases varied from 1 to 3”
Claim · model-written summary
Powdery mildew incidence was higher in pepper fields with a closed canopy.
Verbatim
t0“Powdery Mildew of Pepper”
e0“Incidence was higher in fields where the canopy was closed”
Claim · model-written summary
The disease was not detected in tomato fields or in sowthistle plants near infected pepper fields in Zacatecas.
Verbatim
e0“In Zacatecas the disease was not detected in tomato fields or in sowthistle (Sonchus oleraceae) plants contiguous to, or within, infected pepper fields”
Claim · model-written summary
Light defoliation was observed on pepper plants.
Verbatim
t0“Powdery Mildew of Pepper”
e2“Light defoliation was observed”