Hatching from cysts and egg sacs of <i>Heterodera cruciferae</i> and effects of temperature on hatching and development on oilseed rape

Koshy, P. K.; Evans, K.

doi:10.1111/j.1744-7348.1986.tb03195.x

Cited by 2 publications

(5 citation statements)

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“…The leachates of each cultivar were individually filtered by passing them through a 0.2 ßm aperture Sartodus Minisart filter (Alddch, Poole, UK) and stored at 5°C in the dark for 24 h. The leachate solutions were diluted 1:1 with sterile distilled water to reduce the concentration of any hatch inhibitors present, giving final volumes of 250 ml (50%, v/v) pdor to use (Koshy & Evans, 1986).…”

Section: Preparation Of Osr Leachates For Hatching Testmentioning

confidence: 99%

“…A modification of the methods by Griffin (1980) and Koshy and Evans (1986) was used for this experiment. Four-week-old uniform OSR seedlings of cvs Castille and Flash were transplanted into 6.5 cm diam.…”

Section: Effect Of Temperature On Root Invasion By J2 Of H Schachtiimentioning

confidence: 99%

“…Oilseed rape is particularly vulnerable as it is a good host of H. schachtii, and the extent of damage and yield loss caused in infected plants is exacerbated by short crop rotation cycles, which often include sugar beet. This nematode species has a wide host range in terms of agricultural and horticultural crops and also include some weed species (Koshy & Evans, 1986;Evans & Russell, 1993). This confers the advantage of it being distributed over a wide area where host crops are grown.…”

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Effect of temperature on the life cycle of Heterodera schachtii infecting oilseed rape (Brassica napus L.)

Kakaire

Haydock

2012

Nematol

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Oilseed rape (OSR; Brassica napus L.) is a crop of increasing world importance and suffers yield loss when infected with Heterodera schachtii. The in vitro hatch, in planta root invasion and development of a field population of H. schachtii were investigated in six thermostatically-controlled water baths at temperatures of 5.0, 10.1, 20.5, 27.8, 32.2 and 37.5°C in a glasshouse. The UK winter OSR CVS Flash and Castille were used. Temperature was shown to have a major influence on the development of H. schachtii in OSR. The highest cumulative percentage hatch of second-stage juveniles (J2) observed over an 8-week incubation period occurred between 20.5 and 27.8°C in leachates of both OSR cultivars, indicating that this is the optimum temperature range for hatching of this population. Cumulative hatch was lowest at 37.5 and 5.0°C. Root invasion was inhibited at 5.0 and 37.5°C, whilst the highest number of J2 invaded the roots between 20.5 and 32.2°C, indicating that this is the optimum temperature range for root invasion. The life cycle took between 21 days at 20.5°C and 42 days at 5.0°C from the inoculated J2 to the J2 of the second generation, with the associated accumulated heat units (AHU) of 424 and 203 degree-days with a base temperature (Tb) of 5.0°C. The optimum temperature range (To) for development was between 20.5 and 27.8°C and the maximum (Tm) was 37.5°C. As temperature increased, the AHU required to complete the life cycle increased from 203 degree-days at 5.0°C to 1406 at 37.5°C. Leachates from both OSR cultivars stimulated more J2 to hatch than the distilled water controls. No significant cultivar differences were observed for J2 hatching, root invasion and duration of the life cycle at the different temperatures but significantly more cysts of the second generation (g root)"' were observed in cv. Flash than cv. Castille at 27.8 and 32.2°C, suggesting that the latter cultivar is a poorer host of H. schachtii than cv. Flash. This is the first report of the effect of temperature on H. schachtii development on current winter OSR cultivars in the UK and provides insight into the potential effects of climate change on the nematode-host interaction.

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Section: Preparation Of Osr Leachates For Hatching Testmentioning

confidence: 99%

Section: Effect Of Temperature On Root Invasion By J2 Of H Schachtiimentioning

confidence: 99%

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confidence: 99%

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Effect of temperature on the life cycle of Heterodera schachtii infecting oilseed rape (Brassica napus L.)

Kakaire

Haydock

2012

Nematol

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“…1980), whilst others have suggested there may he a second generation under appropriate weather conditions (Simon, 1958;Sedivy, 1964;Hirling, 1978). A second generation has also been found for other cyst-forming nematodes, Globodera rostochierzsis (Wollenweber, 1923) Behrens 1975(Evans, 1969, and H. cruciferue Franklin 1945 (Koshy & Evans, 1986). Assuming that a life cycle of H. humuli is completed within approximately 50 days the observed fluctuations in second-stage juvenile abundance would indicate two or possibly three generations per year in the weather conditions in Kent.…”

Section: Discussionmentioning

confidence: 86%

“…4). The hatch of other cyst-forming nematode species is also inhibited by high temperature (Kerry & Jenkinson, 1976;Koshy & Evans, 1986).…”

Section: Discussionmentioning

confidence: 99%

Biology of the hop cyst nematode Heterodera humuli

Mende

Mcnamara

1995

Annals of Applied Biology

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SUMMARY Heterodera humuli inhibited plant growth in pot experiments when the nematode population exceeded 500 eggs g‐1 of soil; below this density there was evidence of stimulated growth. The development of H. humuli was tested on seven hop cultivars. No differences were found in the numbers of newly produced cysts on different cultivars but the sizes of the cysts differed significantly. The biggest cysts were found on a wild hop and the smallest on the cultivar ‘OR/55’. The nematode and the fungus, alone or in combination, did not affect the bine length of cvs Northdown or Target. The growth of nematode infested plants of a wilt susceptible hop cultivar was significantly reduced when the plant pathogenic fungus Verticillium albo‐atrum was also present. Verticillium did not significantly influence the reproduction of H. humuli under either laboratory or field conditions although hatching of juveniles in the field was delayed by two weeks and more juveniles were found in the soil during late summer around the roots of fungus infected plants in the field.

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Hatching from cysts and egg sacs of Heterodera cruciferae and effects of temperature on hatching and development on oilseed rape

Cited by 2 publications

References 10 publications

Effect of temperature on the life cycle of Heterodera schachtii infecting oilseed rape (Brassica napus L.)

Effect of temperature on the life cycle of Heterodera schachtii infecting oilseed rape (Brassica napus L.)

Biology of the hop cyst nematode Heterodera humuli

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