Intraspecific competition between larvae of Sitona spp. (Col., Curculionidae)

El‐Dessouki, S. A.; Stein, W.

doi:10.1007/bf00345224

Cited by 11 publications

(7 citation statements)

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“…Nielsen (1990) observed that larval density of S. lineatus on faba beans reached a maximum of 13 per plant, regardless of the number of eggs laid or adult density, and attributed this observation to intraspeciÞc competition among larvae that occurred when the population approached the carrying capacity. Similar results were observed in greenhouse experiments with S. hispidulus: when 50 or 100 eggs were added to individual plants, there was no signiÞcant difference in the number of larvae recovered (El-Dessouki and Stein 1970). It seems that even at the lowest adult densities, the carrying capacity of each plant in the cages was approached, because 1) levels of nodule damage were not affected by adult weevil density, 2) approximately equal numbers of larvae were collected from all cage treatments, and 3) larval density per plant did not increase as adult density and levels of foliar damage increased.…”

Section: Discussionsupporting

confidence: 87%

Response of Pisum sativum (Fabales: Fabaceae) to Sitona lineatus (Coleoptera: Curculionidae) Infestation: Effect of Adult Weevil Density on Damage, Larval Population, and Yield Loss

2011

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Sitona lineatus L. (Coleoptera: Curculionidae) is an invasive pest in North America and its geographical range is currently expanding across the Canadian prairies. Adults and larvae of S. lineatus feed upon the foliage and root nodules, respectively, of field pea, Pisum sativum L. (Fabales: Fabaceae), and may contribute to economic losses when population densities are high. Integrated pest management (IPM) programs that incorporate economic thresholds should be used to manage S. lineatus populations in a sustainable manner. The impact of nitrogen fertilizer on field pea yield and the relationships between adult weevil density and above- and below-ground damage and yield were investigated in southern Alberta, Canada using exclusion cages on field pea plots. In each cage, 32 field pea plants were exposed to weevil densities ranging from zero to one adult weevil per plant. Nitrogen-fertilized plants yielded 16% more than unfertilized plants. Nitrogen-fertilized plants had fewer root nodules than unfertilized plants, but fertilizer had no effect on foliar feeding by S. lineatus. Adult density affected foliar feeding damage, with increases in above-ground damage associated with increases in S. lineatus density. Adult density did not affect root nodule damage, larval density, foliar biomass or seed weight. Overall, these results indicate that terminal leaf damage may be used to estimate adult weevil density but cannot be used to predict larval density or yield loss. Further research is required to better understand the impact of larval damage on yield and determine if economic thresholds can be developed using data from large-scale production systems.

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Section: Discussionsupporting

confidence: 87%

Response of Pisum sativum (Fabales: Fabaceae) to Sitona lineatus (Coleoptera: Curculionidae) Infestation: Effect of Adult Weevil Density on Damage, Larval Population, and Yield Loss

2011

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“…This suggests an increasing mortality at higher adult weevil attack levels. EL-DESSOUKI and STEIN (1970) observed a similar evidence for intraspecific competition among the larvae of Sitona spp.…”

Section: Discussionsupporting

confidence: 63%

“…the number of larvae that could survive on the number of root-nodules set and available throughout the larval growth stage. The results in this study and the study by EL-DESSOUKI and STEIN (1970) may suggest, that within a wide range of S. lineatus attack levels the area grown with field beans and peas may be an important factor for the number of weevils emerging in the autumn, whereas the attack level in the individual field may be of less importance. A large number of factors may influence the survival of adult Sitona and hence the infestation level the following spring.…”

Section: Discussionsupporting

confidence: 46%

“…Nodules are foodresources of very high quality, but a limited resource (GREENWOOD and BATHURST 1978;HEICHEL and VANCE 1983;SUTTON 1983;QUINN and HOWER 1986). It has therefore been suggested that the availability of root-nodules may be a limiting factor of Sitona larval populations ( EL-DESSOUKI and STEIN 1970;QUINN and HOVER 1986;WOLFSON 1987).…”

Section: Discussionmentioning

confidence: 99%

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Yield responses of Vicia faba in relation to infestation levels of Sitona lineatus L. (Col., Curculionidae)

Nielsen¹

1990

J Applied Entomology

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The impact of the pea and bean weevil, S. lineatus, on field beans, V. fuba, was investigated in field cage experiments with controlled attack levels. A decrease in yield up to 28 YO was recorded due to a reduction in the number of pods per plant, whereas the number of seeds per pod and the individual seed weight were unaffected.As the damage was a non-monotonous function of the attack level, the experiment suggests a complex relationshi between attack level and yield loss due to adult weevils feeding on the leaf margins and larvae feeding on the root nodules.The number of larvae shortly before hatching was independent of the adult attack level, as the same numbers of larvae were found in all treatments, thus indicating an increasing mortality at higher population densities. Difficulty of establishment in suitable root nodules and intraspecific competition are considered to be the most important mortality factors.The complex relationship between the attack level and the yield response is discussed in relation to the density dependent mortality of the larvae. A significant correlation between attack level and the number of leaf margin feeding notches following infestation was recorded. This is discussed in relation to monitoring and warning.

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“…The rearing of Sitona spp. under laboratory conditions on their host-plants has met with varying degrees of success, and most attempts have been by mimicking, in pot experiments, the physical and environmental conditions that occur in the field (Wildermuth, 1910;Jackson, 1928;Newton, 1958;Hans, 1961;El-Dessouki & Stein, 1970;El-Dessouki, 1971;Plaut, 1975). None of these studies assessed the success of the particular rearing method used, nor was detailed information presented on the methods.…”

Section: Introductionmentioning

confidence: 99%

A rearing method for Sitona humeralis Stephens (Coleoptera: Curculionidae), and its development under controlled conditions

Sue

Ferro

Emberson

1980

Bull. Entomol. Res.

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Intraspecific competition between larvae of Sitona spp. (Col., Curculionidae)

Cited by 11 publications

References 1 publication

Response of Pisum sativum (Fabales: Fabaceae) to Sitona lineatus (Coleoptera: Curculionidae) Infestation: Effect of Adult Weevil Density on Damage, Larval Population, and Yield Loss

Response of Pisum sativum (Fabales: Fabaceae) to Sitona lineatus (Coleoptera: Curculionidae) Infestation: Effect of Adult Weevil Density on Damage, Larval Population, and Yield Loss

Yield responses of Vicia faba in relation to infestation levels of Sitona lineatus L. (Col., Curculionidae)

A rearing method for Sitona humeralis Stephens (Coleoptera: Curculionidae), and its development under controlled conditions

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