Seasonal Fluctuations in Numbers of Larvae of the Cereal Cyst Nematode (Het'Erodera Avenae) and of Pratylenchus Minyus and T'Ylenchorhynchus Brevidens in Soil

Meagher, JW

doi:10.1163/187529270x00018

Cited by 27 publications

(10 citation statements)

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“…The studies described support field observations (Meagher, 1970(Meagher, , 1972 that in Australia, especially in late-sown crops, seedlings grow poorly in soil where larval populations continue to increase during the early stages of seedling growth. Although plant growth continues during the Australian winter, this slows considerably during the coldest months when the plant/nematode balance is tipped in favour of the nematode.…”

Section: Discussionsupporting

confidence: 79%

“…In fields infested with H. avenue, it is usually observed (Meagher, 1970(Meagher, , 1972) that crops (( sown early H (April-May) are much healthier in appearance, grow more strongly and eventually yield better than crops (( sown late H (June-July).…”

Section: Management Practicementioning

confidence: 99%

“…avenae have usually been based on field observation (Gair, 1965 ;Graham & Stone, 1975 ;Meagher, 1972) where population densities are expressed in terms of numbers of cysts or numbers of eggs/g soil. However, because the pattern of larval emergence is subject to the environmental conditions of soil temperature and moisture (Meagher, 1970), cyst populations may not always give a true indication of the larval population to which roots are exposed in the seedling stage.…”

Section: Delay In Emergence Of Larvaementioning

confidence: 99%

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Yield Loss Caused by Heterodera avenae in Cereal Crops Grown in a Mediterranean Climate1

Meagher

1982

EPPO Bulletin

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In south‐eastern Australia, where large areas of cereal crops are grown in a Mediterranean climate, yield loss caused by Heterodera avenae is generally more severe than in Northern Europe. This appears to be due to differences in seasonal cropping patterns and the stages of crop growth when roots are exposed to larvae. Field observations and laboratory experiments show that, in Australia, crops ≪ sown early ≫, in late autumn, are less damaged than those ≪ sown late ≫. This is explained by the times of emergence and population density of larvae, by the nematode‐fungus interaction and by the environmental conditions affecting plant growth, rather than by differences in the nematode or in host tolerance.

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Section: Discussionsupporting

confidence: 79%

Section: Management Practicementioning

confidence: 99%

Section: Delay In Emergence Of Larvaementioning

confidence: 99%

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Yield Loss Caused by Heterodera avenae in Cereal Crops Grown in a Mediterranean Climate1

Meagher

1982

EPPO Bulletin

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“…In this semiarid climate, the sandy soil is prone to wind erosion and soil may sometimes be transported over long distances (Holt, 1947). Under these circumstances, it has been suggested (Meagher, 1968(Meagher, , 1972(Meagher, , 1974 that the widespread distribution of H. avenae may have been due to wind dispersal of eggs in cysts as there is no evidence that the nematode is indigenous.…”

Section: Introductionmentioning

confidence: 99%

“…It has been reported from both Australia (Meagher, 1970) and Greece (Kyrou, 1976) that eggs in cysts can survive in air-dried soil for long periods. Eggs remain viable for several years when cysts are stored at 5 O C and at low relative humidities (75-40 % RH) (Meagher, 1974).…”

Section: Introductionmentioning

confidence: 99%

The Effect of Environment on Survival and Hatching of Heterodera avenae1

Meagher

1982

EPPO Bulletin

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Eggs within cysts of Heterodera avenae are able to survive long periods of desiccation and can be held for several years at 5oC when stored at low relative humidity. While this provides an excellent means of storing the nematode for use in laboratory experiments, field experiments show that desiccated eggs are readily dispersed by wind. Tolerance to desiccation is similar in free and encysted eggs, which hatch at the same rate. When eggs are desiccated, water is withdrawn from the larva within the egg shell. If cysts are exposed to conditions favouring eclosion, subsequent desiccation reduces egg viability and larval emergence. The importance of defining pre‐test conditions in survival studies is emphasized, and differences in the physiological state of eggs may explain different observations in Australian and European studies.

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Hatch and emergence

Sharma¹,

Sharma²

1998

The Cyst Nematodes

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Seasonal Fluctuations in Numbers of Larvae of the Cereal Cyst Nematode (Het'Erodera Avenae) and of Pratylenchus Minyus and T'Ylenchorhynchus Brevidens in Soil

Cited by 27 publications

References 0 publications

Yield Loss Caused by Heterodera avenae in Cereal Crops Grown in a Mediterranean Climate1

Yield Loss Caused by Heterodera avenae in Cereal Crops Grown in a Mediterranean Climate1

The Effect of Environment on Survival and Hatching of Heterodera avenae1

Hatch and emergence

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