Genotypic resistance in sorghum to head bug, Calocoris angustatus Lethiery

Sharma, H. C.; Lopez, V. F.

doi:10.1007/bf00025250

Cited by 10 publications

(3 citation statements)

References 8 publications

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“…During the 1989 rainy season, six resistant cultivars (IS 17610, IS 20740, IS 16357, IS 14334, IS 21444, and IS 19955) (Sharma & Lopez, 1992b) were compared with three susceptible controls (ICSV 112, CSH 5 and CSH 9) for bug population increase and grain damage . During the 1988/ 89 post-rainy season, head bug fecundity on five bug-resistant genotypes (IS 14334, IS 21444, IS 19955, IS 23748 and IS 16357) was compared with that on two commercial cultivars (CSH 5 and ICSV 112) .…”

Section: Cropmentioning

confidence: 99%

Genotypic effects of sorghum accessions on fecundity of sorghum head bug, Calocoris angustatus Lethiery

1992

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Section: Cropmentioning

confidence: 99%

Genotypic effects of sorghum accessions on fecundity of sorghum head bug, Calocoris angustatus Lethiery

1992

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“…Host plant resistance is an effective means of controlling insects, and considerable genetic variability exists in sorghum for resistance to head bugs (Steck et al, 1989;Sharma & Lopez, 1992a, 1992b. Recent efforts in breeding for resistance to insects in sorghum are largely focused on developing insect-resistant hybrids based on cytoplasmic male-sterility (CMS).…”

Section: Introductionmentioning

confidence: 99%

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et al. 2000

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Sorghum head bug, Calocoris angustatus Lethiery is one of the most important pests of grain sorghum in India. Head bug damage increases the severity of grain molds, which renders the grain unfit for human consumption. Therefore, we studied the gene action for resistance to head bugs and grain molds in a diverse array of male-sterile lines and testers in a line × tester mating design under natural infestation. Mean squares for parents, parents vs crosses, lines, testers, and lines × testers were significant for head bug damage and grain mold severity. General combining ability (GCA) effects were significant and negative for ICSA 88019 for head bug damage, and ICSA 88019 and ICSA 88020 for grain molds (except for ICSA 88020 in 1993). General combining ability effects were positive for ICSA 42 and 296 A. GCA effects of lines and testers for head bug damage and grain mold severity were in the same direction (+ve or-ve). Head bug damage in the grain was significantly correlated with grain mold severity. Testers IS 8891, IS 15107, and TAM 2566 (with colored grain and less susceptibility to molds) produced mold-resistant hybrids in combination with all the male-sterile lines, while the reverse was true in the case of Swarna and ICSV 112. Resistance to head bugs showed dominance to partial dominance type of gene action, while in the case of grain molds, it showed dominance to overdominance. Resistance to these pests is governed by both additive and nonadditive types of gene action. The implications of these results are discussed in relation to need for crop improvement in sorghum.

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“…Plant resistance to insects is an important com-ponent in the management of C. angustatus. Several lines resistant to C. angustatus have been identified (Sharma, 1985;Sharma & Lopez, 1992b). However, environmental conditions change the interactions between the insects and their host plants by influencing the rates of insect development and the physiochemical properties of the plants (Sharma & Lopez, 1991).…”

Section: Introductionmentioning

confidence: 99%

Interactions between panicle size, insect density, and environment for genotypic resistance in sorghum to head bug, Calocoris angustatus

Sharma

Lopez

1994

Entomologia Exp Applicata

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Studies were undertaken on interactions between panicle size, insect density, host plant, and the environment for sorghum head bug, Calocoris angustatus Lethiery on five sorghum genotypes in terms of bug population increase, grain damage and loss in grain mass across four panicle sizes (5, 10 or 20 branches/panicle and whole panicle), and three infestation levels (5, 10 and 15 pairs of bugs/panicle). Head bug numbers increased and grain damage decreased with an increase in panicle size in the head bug susceptible cultivars, CSH 1 and CSH 5. However, the increase in bug numbers or decrease in grain damage was not significant in head bug resistant genotypes, IS 17610 and IS 17645. Head bug numbers increased with an increase in infestation level in CSH 1 and CSH 5, however, such an increase was not substantial in IS 17610 and IS 17645. Grain damage was significantly lower in IS 17610 and IS 17645 compared with CSH 1 and CSH 5 across infestation levels. Head bug population increased at a greater rate during the rainy season compared with the dry season. Panicle size and infestation levels accounted for greater variation in grain damage and percentage loss in grain mass during the rainy season than in the dry season. To identify reliable sources of resistance to insects, it is important to study insect host plant‐interactions across panicle sizes (levels of food availability), infestation levels and season

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Genotypic resistance in sorghum to head bug, Calocoris angustatus Lethiery

Cited by 10 publications

References 8 publications

Genotypic effects of sorghum accessions on fecundity of sorghum head bug, Calocoris angustatus Lethiery

Genotypic effects of sorghum accessions on fecundity of sorghum head bug, Calocoris angustatus Lethiery

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Interactions between panicle size, insect density, and environment for genotypic resistance in sorghum to head bug, Calocoris angustatus

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