scholarly journals Study of plant parasitic nematode population density in Cabbage inRangareddy district, Telangana.

2016 ◽  
Vol 4 (6) ◽  
pp. 423-427
Author(s):  
Sk. Zareena ◽  
◽  
V. VanitaDas. ◽  
Keyword(s):  
Population Density ◽  
Parasitic Nematode ◽  
Plant Parasitic Nematode ◽  
Nematode Population ◽  
Nematode Population Density ◽  
Plant Parasitic

Effect of Previous Rotation on Plant Parasitic Nematode Population in Peanut and Crop Yield

cftm ◽  
2017 ◽  
Vol 3 (1) ◽  
pp. cftm2016.12.0086 ◽  
Author(s):  
David L. Jordan ◽  
Tommy Corbett ◽  
Clyde Bogle ◽  
Barbara Shew ◽  
Rick Brandenburg ◽  
...  
Keyword(s):  
Crop Yield ◽  
Parasitic Nematode ◽  
Plant Parasitic Nematode ◽  
Nematode Population ◽  
Plant Parasitic

scholarly journals Use of Entomopathogenic Nematodes and Thyme Oil to Suppress Plant-Parasitic Nematodes on English Boxwood

Plant Disease ◽  
2006 ◽  
Vol 90 (4) ◽  
pp. 471-475 ◽  
Author(s):  
Enrique E. Pérez ◽  
Edwin E. Lewis
Keyword(s):  
Population Growth ◽  
Entomopathogenic Nematodes ◽  
Parasitic Nematode ◽  
Nematode Species ◽  
Plant Parasitic Nematode ◽  
Nematode Population ◽  
Parasitic Nematodes ◽  
Plant Parasitic Nematodes ◽  
Thyme Oil ◽  
Plant Parasitic

A 2-year experiment was conducted to test suppression of plant-parasitic nematodes on English boxwood using entomopathogenic nematodes and 3.5% thyme oil formulated as Promax. Treatments were Steinernema riobrave formulated as BioVector and S. feltiae formulated as Nemasys, both applied at a rate of 2.5 billion infective juveniles/ha, thyme oil at rate of 9.3 liters/ha, and nontreated control. In the 2001 season, treatment with S. feltiae reduced (P ≤ 0.05) the population growth of Tylenchorhynchus sp. 7 days after treatment and Hoplolaimus sp. 30 and 60 days after treatment. Treatment with S. riobrave reduced (P ≤ 0.05) the population growth of all plant-parasitic nematode species at all sampling dates, with the exception of Mesocriconema sp. 30 days after treatment and Tylenchorhynchus sp. and Rotylenchus buxophilus 60 days after treatment. Treatment with thyme oil reduced (P ≤ 0.05) the population growth of all plant-parasitic nematode genera at all sampling dates except Tylenchorhynchus sp. and R. buxophilus 60 days after treatment. In the 2002 season, treatment with S. feltiae had no effect on nematode population growth. Treatment with S. riobrave reduced (P ≤ 0.05) the population growth of R. buxophilus 7 days after treatment, and all plant-parasitic nematodes 30 and 60 days after treatment except Hoplolaimus sp. 30 days after treatment and Mesocriconema sp. 60 days after treatment. Treatment with thyme oil reduced (P ≤ 0.05) the population growth at all sampling dates of plant-parasitic nematodes except Mesocriconema sp. 60 days after treatment.

scholarly journals INFLUENCE OF SOIL PROPERTIES ON PLANT NEMATODE POPULATION DENSITY UNDER Chromolaena odorata FALLOW

2017 ◽  
Vol 16 (1) ◽  
pp. 105-115
Author(s):  
SEGUN I. ODEYEMI, ◽  
AFOLAMI, S. OLAOLUWA ◽  
AZEEZ J. OLADIPUPO
Keyword(s):  
Population Density ◽  
Parasitic Nematode ◽  
Abiotic Factors ◽  
Chemical Properties ◽  
Nematode Species ◽  
Plant Parasitic Nematode ◽  
Chromolaena Odorata ◽  
Popu Lation ◽  
Physico Chemical ◽  
Plant Parasitic

Relationships between soil abiotic factors and population densities of plant parasitic nematodes spe-cies under planted fallow of Chromolaena odorata was investigated for 2 years. Soil samples were collected at 0 – 30 cm depth to determine population of nematode species and soil physico-chemical properties was done at test initiation and afterwards at 6 months interval for 2 years. Four genera of plant parasitic nematode species (Meloidogyne spp., Pratylenchus spp, Helicotylenchus spp. and Xiphinema spp) and two free – living (Rhabditids and Dorylaimus spp.) were identified in the fallow. Soil organic Matter and soil N were significantly higher at 2 years than at 6, 12 and 18 months. Popu-lation density of plant parasitic nematode species significantly reduce as the fallow period extend reaching minimum at 2 years of fallow. Highest percentage reduction of 90.3 % was observed in popu-lation of Xiphinema at 2 years of fallow, followed by Pratylenchus with 51.5 % reduction in population and lowest reduction of 44 % was observed in Meloidogyne population. Negative and significant rela-tionship existed between soil physico-chemical properties and population density of plant parasitic nematode species indicated that soil characteristics play an important role in the abundance, distribu-tion and structure of nematode communities.

Infective juvenile formation in the insect parasitic nematode Steinernema feltiae

Parasitology ◽  
1989 ◽  
Vol 99 (1) ◽  
pp. 77-81 ◽  
Author(s):  
Irene Popiel ◽  
Donna L. Grove ◽  
M. J. Friedman
Keyword(s):  
Population Density ◽  
Large Scale ◽  
Liquid Culture ◽  
Parasitic Nematode ◽  
Nematode Population ◽  
Steinernema Feltiae ◽  
Infective Juvenile ◽  
Environmental Cues ◽  
Egg Hatching ◽  
Nematode Population Density

SUMMARYSteinernematid nematodes form a developmentally arrested infective juvenile (IJ) stage at the second moult, when conditions inside the insect host are no longer suitable for further reproduction. In a liquid culture micro-assay two environmental cues were shown to influence the formation of Steinernema feltiae IJs. High nematode population density induced IJ formation, suggesting the presence of a nematode pheromone. Bacterial food and soluble nutrients acted competitively to reduce the frequency of IJ formation. Frequency of IJ formation was greatest when lst-stage juveniles were subjected to IJ-inducing conditions. The optimum temperature range for the IJ induction response was 25–30°C. These findings suggest that maximal IJ production in large-scale liquid culture will depend on the correct balance of nematode population density and nutrient availability at the peak of egg hatching.

scholarly journals Mineral composition of beetroot treated with potential elicitors and inoculated with Meloidogyne javanica

2020 ◽  
Vol 7 (1) ◽  
Author(s):  
Paula Juliana Grotto Débia ◽  
Beatriz Cervejeira Bolanho ◽  
Claudia Regina Dias-Arieira
Keyword(s):  
Population Density ◽  
Mineral Composition ◽  
Integrated Management ◽  
Meloidogyne Javanica ◽  
Nematode Population ◽  
Root Knot Nematode ◽  
Cu Content ◽  
Manganese Zinc ◽  
Nematode Population Density ◽  
Elicitor Treatments

Abstract Background The root-knot nematode Meloidogyne javanica can infect beetroots, causing extensive damage to this food crop. As chemical and genetic control tactics have shown limited efficacy, new strategies are needed to improve the integrated management of this parasite. This study assessed the influence of potential defence elicitors and M. javanica infection on the mineral composition of beetroot. Plants were treated with acibenzolar-S-methyl (ASM), citrus biomass, or a mannanoligosaccharide-based product (MOS) and inoculated with 1000 eggs and second-stage juveniles of M. javanica. At 60 days after inoculation, beetroot plants were harvested and evaluated for nematode population density, vegetative growth, and mineral content. Results All potential elicitors reduced nematode population density in beetroots (p ≤ 0.10) and improved the vegetative parameters of inoculated plants (p ≤ 0.05), except shoot fresh weight. Some minerals were found to be negatively affected by treatments, particularly calcium, whose levels were consistently lower in treated plants. On the other hand, M. javanica inoculation increased magnesium, iron, manganese, zinc, and copper contents in beetroots. However, the latter mineral (Cu content) of inoculated plants was positively influenced by MOS and ASM. Conclusion Potential elicitor treatments did not improve the mineral composition of beetroot, but were effective in reducing nematode population density. Plants inoculated with M. javanica had higher mineral levels. However, gall formation decreases the commercial value of the crop and might render it unsuitable for commercialisation. M. javanica-infected beetroots may be used for nutrient extraction or sold to food processing industries.

Sign in / Sign up

Export Citation Format

Share Document