Determination of Root Lesion Nematodes (Pratylenchus spp.) on Dry Bean Growing Areas in Central Kızılırmak Valley (original) (raw)
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Nematologia …, 2002
Investigations were undertaken in 2000-2001 to evaluate the reaction of 99 faba bean lines (40 from Algeria, 6 from Morocco and 53 from Tunisia) to six populations of the root lesion nematodes, three of Pratylenchus thornei and one each of P. neglectus, P. penetrans and P. pinguicaudatus. Groups of fifty clay pots were sown with three seeds/pot of each line and maintained in a glasshouse at 22 ±2°C. Two pots of each line and nematode population were inoculated with 15,000 nematodes/pot. The lines FRYT98-6 and FRYT98-60 were completely free of P. neglectus infestation. Numbers of P. thornei of Italian, Moroccan and Tunisian populations in the roots of the lines FRYT98-35, FRYT98-47 and FRYT98-56 were low. The infestation of P. penetrans and P. pinguicaudatus was also low in the lines FRYA98-48 and FRYT98-44, respectively.
Australasian Plant Pathology, 2003
Quantification of root lesion nematodes (Pratylenchus thornei and P. neglectus) was evaluated using three different methods; the Whitehead tray method, the mister method and the commercially available quantitative DNA assay. These methods were compared to determine the effect of soil water content, sampling method and soil storage conditions on estimates of pre-sowing densities of nematodes. The Whitehead tray method, which is reliant on extraction of live nematodes, recovered fewer nematodes from dry soil than from moist soil and fewer from soil dried before storage. By contrast, the DNA assay was not influenced by soil water content at the time of sampling or drying of the soil after sampling. A P 0 2 0 7 1 Q u a n t i f i c a t i o n o f r o o t l e s i o n n e m a t o d e s ( P r a t y l e
Distribution of root-knot nematodes on agricultural plants, harm and their host plants
2020
The article presents data on the spread of root-knot nematodes on crops, harm and host plants in the conditions of the Tashkent oasis. It has been established that 5 species of root nematodes are found in cultivated and wild plants Meloidogyne javanica, M. arenaria, M. incognita, M. acrita, M. plum, which are common in vegetables and melons and cause great damage to these plants. Nematode M.javanica was found in the roots of plants such as sunflower, cabbage, watermelon, cucumber, pumpkin, zucchini, melon, corn, tomato, beets, eggplant and carrots, in the foci of infection of the plant 20-60 %, the level of damage to the root system is 4-5 points; damage to plants such as cucumber, pumpkin, tomato and potato by the nematode M. arenaria is 20-60 %, damage to the root system is 4-5 points, damage to sunflower, radish and dill is 2035 %, damage to the root system is 1.0-2.8 points, the damage to plants such as clover and onions was 15-20 %. Damage to plants such as beets, cabbage, pump...
Nematology, 2012
The distribution of important plant-parasitic and free-living nematodes in the cereal production areas of the Central Anatolian Plateau (CAP) of Turkey was investigated with systematic surveys. Two important plant-parasitic nematode groups were found widely distributed; cereal-cyst nematodes (78.3%) and root-lesion nematodes (42.6%). Cereal cyst nematodes (CCN) were identified as Heterodera filipjevi in 18 provinces. Heterodera latipons was found in only one province. Pratylenchus thornei and P. neglectus were the most widely distributed species of root-lesion nematodes. Other frequently recorded plant-parasitic nematodes belonged to the genera Geocenamus (52.4%), Pratylenchoides (35.6%), Helicotylenchus (29.7%) and Paratylenchus (19.2%). Konya on the southern CAP had a significantly high incidence of P. neglectus as well as free-living nematodes. The incidence of CCN was greatest in areas of sandy soils on the CAP, with densities of up to 95 cysts (100 g soil)−1. Population densiti...
Phytopathology, 2006
The vertical distribution of Pratylenchus penetrans was monitored in four fields cropped with maize, black salsify, carrot, or potato. Soil samples were collected at 21-day intervals from May 2002 until April 2003 from five plots (2 × 5 m2) per field. Per plot, 15 cores were taken to a depth of 70 cm and split into seven segments of 10 cm each. Within the plots, segments from corresponding depths were pooled. After mixing, 200-g subsamples were taken and nematodes were extracted by zonal centrifugation from the root fraction and the mineral soil fraction separately. In most crops, the root fraction contained more than 50% of the total number of P. penetrans. Because the ratio between the numbers of nematodes in the root fraction and mineral soil fraction changes during the growing season, numbers of P. penetrans found in the mineral soil fraction cannot be used to estimate the total number in the soil. Therefore, both fractions have to be processed to obtain a reliable estimate of t...
Molecular Studies on Root-Knot Nematodes in Protected Cultivations of Turkey
Turkey is one of the most important agricultural producers in the world. Protected vegetables are widely cultivated in the different regions of Turkey due to its climatic condition. Root-knot nematodes (RKN) cause considerable yield losses in the protected vegetable growing locations of Turkey. They infect plant roots, causing the recession on plant growth by development of root-knot galls draining the plant's photosynthate and nutrients. While infected young plants may be lethal, grown plants mainly cause greater yield losses. Correspondingly, the infection by nematodes leads secondary infection resulting soil borne pathogens. Therefore, they cause considerable yield losses depending conditions occurring in fields of intensively protected cultivations. The purpose of this review is to address identification and investigation of genetic variation of the root-knot nematodes using molecular methods, and explanation of breeding programs currently carrying out for them on tomato in Turkey.
Phytophagous nematodes in cereal fields in Niğde Province, Turkey
Turkish Journal of Entomology
This study evaluated the occurrence and incidence of phytophagous nematodes and identified the cereal cyst nematode species by morphological and molecular tools in the main cereal-growing areas in Niğde in 2018-2019. Phytophagous nematodes within twelve genera were detected in 95% of soil samples. The most common phytophagous nematodes in cereal soil were in the genera Heterodera, Ditylenchus, Merlinius, Pratylenchus, Aphelenchus, Aphelenchoides, Tylenchus, Helicotylenchus, Trophurus, Pratylenchoides, Filenchus and Xiphinema (in decreasing order of incidence). In particular, 75% of the soil samples from surveyed fields were infested with the cereal cyst nematodes (Heterodera spp.). Morphological characteristics of cysts and second-stage juveniles were calculated within the expected ranges for Heterodera filipjevi (Madzhidov, 1981) Stelter, 1984, however, two populations from Çamardı was determined as Heterodera latipons Franklin, 1969 (Tylenchida: Heteroderidae). Intraspecific variation was not observed within the populations of H. filipjevi which could be in the same genotypic group. In addition to the high incidence of these Heterodera spp., intensive cereal cropping systems with/without non-cereal rotations in wheat production areas of Niğde also resulted in high incidence of root lesion nematode, Pratylenchus species.