Resistance in Cucumis sativus L. to Tetranychus urticae Koch. 1. The role of plant breeding in integrated control

Ponti, O. M. B. de

doi:10.1007/bf00021688

Cited by 21 publications

(11 citation statements)

References 44 publications

(13 reference statements)

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“…In addition to random variation or the large environmental differences between the laboratory and the practical test, these discrepancies might be caused by an essential difference between the two tests. The former measures aspects of resistance only, whereas the damage index of the latter reflects the resultant of aspects of resistance and tolerance (for definitions see DE PONTI, 1977a). If this explanation is right, PI 181756 is resistant but at the same time very sensitive and reversely PI 279466 is susceptible but tolerant.…”

Section: Resultsmentioning

confidence: 99%

“…During the summer of 1975, 395 varieties of the Cucumis sativus collection of the institute were planted in a glasshouse with three plants per variety and no replications. The plots were well isolated from one another, so that nonpreference, as defined by DE PONTI (1977a), was excluded. The plants were grown on strings in accordance with common practice at minimum day and night temperatures of 22 and 20°C respectively.…”

Section: Methodsmentioning

confidence: 99%

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Resistance in Cucumis sativus L. to Tetranychus urticae Koch. 3. Search for sources of resistance

Ponti¹

1978

Euphytica

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Resistance in Cucumis sativus L. to Tetranychus urticae Koch. 3. Search for sources of resistance

Ponti¹

1978

Euphytica

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“…There, Dabrowski (1976), de Ponti (1977, and Kogan and Ortman (1978), proposed some modifications in the classification and definitions. There, Dabrowski (1976), de Ponti (1977, and Kogan and Ortman (1978), proposed some modifications in the classification and definitions.…”

Section: Discussionmentioning

confidence: 99%

Some field and screenhouse experiments on maize resistance to Chilo partellus under Western Kenya conditions

Dąbrowski

Nyangiri

1983

Int. J. Trop. Insect Sci.

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The results of five experiments on maize resistance to Chilo partellus, suggest that there are at least five levels of relationships affecting plant colonization, larval survival and damage level: nonacceptance for oviposition shown by Inbred D and G and CIMMYT lines 125, 33, 324 and 178 (s 3 ). Preferred Inbred A was oviposited 2-3 times higher. Feeding of young larval instars on young leaves or leaf sheaths, reduced on CIMMYT lines 324, 125 and 33; concentration of feeding of young larval instars on the upper growing part of plant, extensive on the highly susceptible Inbred A and reduced on all resistant lines tested; penetration of young larval instars into stem, reduced on CIMMYT lines 34 and 125 and Inbred G; and feeding of older larval instars in stem, reduced on CIMMYT lines 324, 178, 125 and Inbred G.

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“…All the genotypes were grouped in to different categories on the basis of percent fruit damage and number of larvae per fruit. Plant herbivore interactions are influenced by several morphological and biochemical plant traits, environmental conditions and physiological status of the tests insects (De-Ponti, 1977).…”

Section: Methodsmentioning

confidence: 99%

Antixenosis Studies in Different Genotypes of Bitter Gourd Fruits against the Infestation of Melon Fruit Fly

Nath¹,

Pandey²,

Kumar³

et al. 2017

JAS

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In crop plants, three principle mechanism viz., non-preference (antixenosis), antibiosis and tolerance are responsible for imparting resistance to insects. Non preference denotes a group of plants character and insect response that keep away the insect from using a particular plant or variety for oviposit ion, food, shelter, or combination of both. Keeping in this view, seventy four promising genotypes of bitter gourd were screened against fruit fly infestation to identify the antixenosis traits involved in host plant selection by the melon fruit fly. On the basis of percent fruit infestation and the average number of larvae per damage fruit, the genotypes were categorized in to different groups i.e. (Highly resistant, resistant, moderately resistant, susceptible, and highly susceptible). The fruit infestation during the 2006 and 2007 summer season (Average of two years) ranged from 13.23% to 83.75%. Larval density per fruit ranged from 2.59 to 8.13 larvae per fruit. The larval density increased with the increase in percent fruit infestation and showed significant positive correlation (r = 0.98).The depth of ribs in resistant genotypes was higher as compared to susceptible genotypes. The number of seed was recorded maximum in the genotype and minimum was recorded in the genotype IC 68314(14.8). The fruit toughness had significant negative effect on fruit infestation(r = -0.52) and larval density (r = -0.57) of fruit fly. There was a strong correlation between number of ribs and fruit toughness, and these traits can be used as markers to select bitter gourd genotype resistant to melon fruit fly.

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Resistance in Cucumis sativus L. to Tetranychus urticae Koch. 1. The role of plant breeding in integrated control

Cited by 21 publications

References 44 publications

Resistance in Cucumis sativus L. to Tetranychus urticae Koch. 3. Search for sources of resistance

Resistance in Cucumis sativus L. to Tetranychus urticae Koch. 3. Search for sources of resistance

Some field and screenhouse experiments on maize resistance to Chilo partellus under Western Kenya conditions

Antixenosis Studies in Different Genotypes of Bitter Gourd Fruits against the Infestation of Melon Fruit Fly

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