Nematode Population Threshold Levels

Ravichandra, N. G.

doi:10.1007/978-81-322-1841-8_6

Cited by 2 publications

(2 citation statements)

References 11 publications

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“…The lowest number was recovered in October 2015 whereas the highest numbers were recovered in December 2015. The economic threshold (ETH) for dagger nematode was determined to be 50-100 individuals /100cm 3 of soil for horticultural crops (Ravichandra, 2014). This can explain the observed damage of sampled tree since the highest recovered population during 2015 reached 88 individuals /100 cm 3 of soil while it was only 30 individuals/100cm 3 of rhizosoil in previous year.…”

Section: Resultsmentioning

confidence: 96%

Population Dynamics of Dagger Nematode Attacking Aleppo Pine Tree in Jordan

Irshaid¹,

Al-Banna²,

Sadder³

2016

AGR

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The temporal distribution of an isolate of the dagger nematode attacking Aleppo pine, Pinus halepensis grown in AL-Jubiha area in Jordan was investigated. A total of eighteen samples were collected from rhizosphere about 30 cm deep in soil and 50 cm away from the trunk of a Pine tree showing decline and brown needles as one sample per month starting in November 2014 until April 2016. Cobb sieving and gravity methods were used for the nematode isolation from rhizosoil. The soil type is clay with 51 % porosity. The monthly air temperature, precipitation, and relative humidity were monitored and tabulated. The results showed that the number of recovered nematodes ranged from 2 individuals /100 cm 3 to 88 individuals /100cm 3 of rhizosoil. The lowest number was recovered on October whereas the highest numbers were recovered in December. The reason of decline in numbers may be due to a raise in temperature. The highest number may be due to favorable temperature and soil moisture. The difference of nematode in same month in two different years may be due to the temperature and precipitations.

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Section: Resultsmentioning

confidence: 96%

Population Dynamics of Dagger Nematode Attacking Aleppo Pine Tree in Jordan

Irshaid¹,

Al-Banna²,

Sadder³

2016

AGR

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“…Yolo Wonder) to M. incognita of 0.065 eggs and juveniles per g loamy sand soil. Difference in tolerance limits and minimum yields of various studies can be a consequence of variation in plant species and cultivar, nematode species and population, soil type (Hussey & Janssen 2002, Greco & Di Vito 2009, Ravichandra 2014, the way of collecting and using the inoculum (Hussey & Barker 1973, Vrain 1977, Di Vito et al 1986, and environmental conditions (Mekete et al 2003).…”

Section: Equationmentioning

confidence: 99%

Damage of the Root-Knot Nematode Meloidogyne javanica to Bell Pepper, Capsicum annuum

Moosavi

2015

J Plant Dis Prot

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Root-knot nematodes are the most economically important nematodes on a worldwide basis. Prediction of the crop loss that a certain population density of nematode may cause is of importance to decide whether to cultivate a plant or not. It is also of use for choosing the most suitable managing strategies. A pot experiment was devised to determine the damage potential of an Iranian population of Meloidogyne javanica on pepper (cv. California Wonder). Two leaves seedlings were planted in 3 kg pots contain different inoculum level of 0, 0. 125, 0.25, 0.5, 1, 2, 4, 8, 16, 32, 64, 128, 256 and 512 eggs and juveniles g -1 sandy loam soil. Shoot weight, yield and nematode reproduction rate were negatively correlated with initial inoculum level of nematode while the root response was variable. Seinhorst's model fitted the data of yield and shoot weight and a tolerance limit of 0.5 and 0.28 eggs and juveniles g -1 soil was respectively estimated. The minimum relative yield and shoot weight was 0.16 and 0.3, respectively. The damage threshold was estimated of 1.8 eggs and juveniles g -1 soil by Seinhorst's model. The maximum multiplication rate and the equilibrium density of M. Javanica were estimated as 708.31 and 159.65 (eggs and juveniles g -1 soil), respectively.

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Nematode Population Threshold Levels

Cited by 2 publications

References 11 publications

Population Dynamics of Dagger Nematode Attacking Aleppo Pine Tree in Jordan

Population Dynamics of Dagger Nematode Attacking Aleppo Pine Tree in Jordan

Damage of the Root-Knot Nematode Meloidogyne javanica to Bell Pepper, Capsicum annuum

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