Nematicidal Activity of trans-2-Hexenal against Southern Root-Knot Nematode (Meloidogyne incognita) on Tomato Plants

2017 ◽  
Vol 65 (3) ◽  
pp. 544-550 ◽  
Author(s):  
Hongbao Lu ◽  
Shuangyu Xu ◽  
Wenjuan Zhang ◽  
Chunmei Xu ◽  
Beixing Li ◽  
...  
Keyword(s):  
Meloidogyne Incognita ◽  
Nematicidal Activity ◽  
Root Knot Nematode ◽  
Tomato Plants ◽  
Southern Root Knot Nematode

scholarly journals Nematicidal Activity of Monoterpenoids Against the Root-Knot Nematode Meloidogyne incognita

2010 ◽  
Vol 100 (2) ◽  
pp. 199-203 ◽  
Author(s):  
Sergio Echeverrigaray ◽  
Jucimar Zacaria ◽  
Ricardo Beltrão
Keyword(s):  
Meloidogyne Incognita ◽  
Nematicidal Activity ◽  
Root Knot Nematode ◽  
High Concentration ◽  
Tomato Plants ◽  
Pot Experiments ◽  
Low Concentrations ◽  
Dose Dependent ◽  
Dose Dependent Effect

Nematicidal activity of 22 monoterpenoids were evaluated in vitro and in pot experiments. Twenty of the twenty-two monoterpenoids significantly reduced hatching, and 11 reduced J2 mobility of the root-knot nematode Meloidogyne incognita at a concentration of 250 mg/liter. In general, compounds with hydroxyl and carbonyl groups exhibited higher nematicidal activity than other terpenoids. Borneol, carveol, citral, geraniol, and α-terpineol showed the highest nematicidal activity among the in vitro tested monoterpenoids. These compounds exhibited a dose dependent effect, and drastically reduced eggs hatching and J2 viability at low concentrations. These monoterpenoids, at 100 and 250 mg/kg concentration, diminished root galling of tomato plants in pot experiments. The results suggest that the selected monoterpenoids, and essential oils with high concentration of these compounds, are potential nematicides against Meloidogyne.

scholarly journals Nematicidal Activity of Grammicin Biosynthesis Pathway Intermediates in Xylaria grammica KCTC 13121BP against Meloidogyne incognita

Molecules ◽  
2021 ◽  
Vol 26 (15) ◽  
pp. 4675
Author(s):  
Yoonjee Kim ◽  
Kalaiselvi Duraisamy ◽  
Minhye Jeong ◽  
Sookyoung Park ◽  
Soonok Kim ◽  
...  
Keyword(s):  
Meloidogyne Incognita ◽  
Nematicidal Activity ◽  
Biosynthesis Pathway ◽  
Gall Formation ◽  
Root Knot Nematode ◽  
Tomato Plants ◽  
Wettable Powder ◽  
Dna Insertion ◽  
Endolichenic Fungus ◽  
Powder Type

Grammicin, a polyketide metabolite produced by the endolichenic fungus Xylaria grammica KCTC 13121BP, shows strong nematicidal activity against Meloidogyne incognita. This study was performed to elucidate the grammicin biosynthesis pathway of X. grammica KCTC 13121BP and to examine the nematicidal activity of the biosynthesis intermediates and derivatives against M. incognita. Two grammicin biosynthesis intermediates were isolated from a T-DNA insertion transformant (strain TR-74) of X. grammica KCTC 13121BP and identified as 2-(hydroxymethyl)cyclohexa-2,5-diene-1,4-dione (compound 1) and 2,5-dihydroxybenzaldehyde (compound 2), which were also reported to be intermediates in the biosynthesis pathway of patulin, an isomer of grammicin. This indicates that the grammicin biosynthesis pathway overlaps almost with that of patulin, except for the last few steps. Among 13 grammicin biosynthesis intermediates and their derivatives (except grammicin), toluquinol caused the highest M. incognita J2 mortality, with an LC50/72 h value of 11.13 µg/mL, which is similar to grammicin with an LC50/72 h value of 15.95 µg/mL. In tomato pot experiments, the wettable powder type formulations (WP) of toluquinol (17.78 µg/mL) and grammicin (17.78 µg/mL) also effectively reduced gall formation on the roots of tomato plants with control values of 72.22% and 77.76%, respectively, which are much higher than abamectin (16.67%), but lower than fosthiazate (100%). The results suggest that toluquinol can be used directly as a biochemical nematicide or as a lead molecule for the development of new synthetic nematicides for the control of root-knot nematode diseases.

scholarly journals Potential of non-fumigant nematicides at different formulations against southern root-knot nematode (Meloidogyne incognita) on tomato plants

2019 ◽  
Vol 8 (1) ◽  
pp. 23-28
Author(s):  
Mohamed S. Khalil ◽  
Abdulqawi A. A. Alqadasi
Keyword(s):  
Meloidogyne Incognita ◽  
Dry Weight ◽  
Parasitic Nematodes ◽  
Plant Parasitic Nematodes ◽  
Root Knot Nematode ◽  
Tomato Plants ◽  
Shoot Dry Weight ◽  
Soil Population ◽  
Meloidogyne Spp ◽  
Southern Root Knot Nematode

Currently, plant parasitic nematodes (PPN) especially root knot nematodes, Meloidogyne spp. have been found involved in the global losses of tomato crops. The most employed tactic for managing PPN in Africa is non-fumigant nematicides. Recently, in Egypt abamectin was recorded as a new tool to control PPN. Thus, two pot experiments were conducted to evaluate the potential of abamectin and certain non-fumigant nematicides namely; oxamyl and ethoprophos at two different formulations (granular and liquid) against southern root knot nematode (Meloidogyne incognita) on tomato plants under greenhouse conditions. Results revealed the granular formulations of ethoprophos and oxamyl, in addition to abamectin, showed the same significance (P≤0.05) in suppressing tomato soil population and root galls of M. incognita, during both experiments. However, liquid formulations of ethoprophos and oxamyl gave relatively less decreasing in soil population and root galls. On the other hand, all applied treatments improved plant growth criteria ranging from 36.92 to 126.44% in shoot dry weight and from 31.25 to 137.50% in root dry weight for both experiments.

scholarly journals Systemically Induced Resistance and Microbial Competitive Exclusion: Implications on Biological Control

2012 ◽  
Vol 102 (3) ◽  
pp. 260-266 ◽  
Author(s):  
A. Martinuz ◽  
A. Schouten ◽  
R. A. Sikora
Keyword(s):  
Meloidogyne Incognita ◽  
Defense Mechanisms ◽  
Root Colonization ◽  
Competitive Exclusion ◽  
Spatial Separation ◽  
Agricultural Pests ◽  
Root Knot Nematode ◽  
Tomato Plants ◽  
Split Root ◽  
Induce Resistance

The root-knot nematode, Meloidogyne incognita, is among the most damaging agricultural pests, particularly to tomato. The mutualistic endophytes Fusarium oxysporum strain Fo162 (Fo162) and Rhizobium etli strain G12 (G12) have been shown to systemically induce resistance toward M. incognita. By using triple-split-root tomato plants, spatially separated but simultaneous inoculation of both endophytes did not lead to additive reductions in M. incognita infection. More importantly, spatially separated inoculation of Fo162 and G12 led to a reduction in Fo162 root colonization of 35 and 39% when G12 was inoculated on a separate root section of the same plant in two independent experiments. In an additional split-root experiment, spatial separation of Fo162 and G12 resulted in a reduction of Fo162 root colonization of approximately 50% over the water controls in two independent experiments. The results suggested that the suppressive activity of G12 on Fo162 and M. incognita is possibly related to the induction of specific plant defense mechanisms. Thus, although Fo162 and G12 have the ability to systemically repress M. incognita infection in tomato, they can be considered incompatible biocontrol agents when both organisms are present simultaneously on the same root system.

scholarly journals Controlling the southern root-knot nematode (Meloidogyne incognita Chitwood) with grafted and resistant pepper varieties

2010 ◽  
Vol 16 (2) ◽  
Author(s):  
Z. Mándoki
Keyword(s):  
Meloidogyne Incognita ◽  
Control Method ◽  
Environmentally Friendly ◽  
Bell Pepper ◽  
N Gene ◽  
Root Knot Nematode ◽  
Resistant Varieties ◽  
Environmentally Safe ◽  
Resistant Rootstock ◽  
Southern Root Knot Nematode

Newly bred resistant bell pepper varieties and those grafted onto resistant rootstock s were tested in soil severely infested with southern root-knot nematode [Meloidogy11e incognita (Kofoid and White) Chitwood] in unheated plastic house and compared to varieties on their own roots, in order to evaluate the efficiency of this environmentally friendly control method. 'Cinema F I ' carrying the N gene yielded significantly more than the two susceptible varieties. Varieties grafted onto resistant rootstocks outyielded those on their own roots although to different extent, which was not always significant. At the end of the vegetat ion period the roots of the rootstocks were undamaged and the roots of some resistant varieties were slightly infected. whereas the roots of susceptible varieties were severely damaged. According to our result  . both the use of resistant varieties and grafted plants offer an effective and environmentally safe way of controlling M. incognita.

scholarly journals Effect of Glomus Mosseae (Arbuscular Mycorrhizal Fungus) On Host - Parasite Relationship of Meloidogyne Incognita (Southern Root-Knot Nematode) on Four Improved Cowpea Varieties

2010 ◽  
Vol 50 (3) ◽  
pp. 321-325 ◽  
Author(s):  
Ishola Odeyemi ◽  
Steve Afolami ◽  
Olufemi Sosanya
Keyword(s):  
Meloidogyne Incognita ◽  
Glomus Mosseae ◽  
Mycorrhizal Fungus ◽  
Arbuscular Mycorrhizal ◽  
Root Knot Nematode ◽  
Parasite Relationship ◽  
Cowpea Varieties ◽  
Host Parasite ◽  
Southern Root Knot Nematode ◽  
Relationship Of

Effect of Glomus Mosseae (Arbuscular Mycorrhizal Fungus) On Host - Parasite Relationship of Meloidogyne Incognita (Southern Root-Knot Nematode) on Four Improved Cowpea VarietiesTwo pot experiments and a field study were conducted in a Randomized Complete Block Design (RCBD). The experiments were conducted to determine the effect ofGlomus mosseae, a mycorrhiza fungus, on the reaction of four improved cowpea varieties toMeloidogyne incognita.Cowpea plants were inoculated with a single or a combination of 5 000 eggs ofM. incognitaand 50 g ofG. mosseaeinoculum containing 5 spores/g of soil. The standardized method of screening and reporting resistance of crop germplasm to root-knot nematodes at 60 days after planting, and the modified version of including yield for resistance rating at harvest were used for this study. Root galling due toM. incognitainfection was significantly lower on all the cowpea varieties treated withG. mosseaeand more significantly on IT90K-277-2 and IT89KD-288 in the screenhouse.G. mosseae, suppressed root-knot nematode reproduction on all the varieties compared to cowpea plants infected only byM. incognitaboth in the screenhouse and field experiments. Also,G. mosseaemitigated the damage attributable to the root-knot nematode on all these varieties. Using Gall Index (GI), reproduction factor and yield,G. mosseaewas effective in improving the resistance of the cowpea varieties toM. incognita.IT90K-76 cowpea variety was consistently resistant to the root-knot nematode, while IT90K-277-2 was tolerant withM. incognitainfection but resistant withG. mosseaetreatment. IT90K-941-1 variety was resistant in the screenhouse. The results of this study also confirmedG. mosseaeas a potential bio-control agent forM. incognitaon these cowpea varieties.

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