Centeral Agricultural Pesticides Laboratory
Alexandria | Egypt
Specialties: plant protection
Journal of Biopesticides
A greenhouse experiment was conducted to evaluate the efficacy of certain microbial agents against Meloidogyne incognita infesting tomato plants (cv. super strain B). The treatments were the antagonistic bacteria Bacillus subtilis and Bacillus thuringiensis, the antagonistic fungus Paecilomyces lilacinus and mycorrhizal fungi Glomus intraradices and Glomus macrocarpium which were compared with the synthesis nematicides Oxamyl and Cadusafos. The Paecilomyces lilacinus product was the best treatment in suppressing the root-knot populations in the soil with (85.2%), followed by those with B. subtilis and B. thuringiensis with 82.6 and 80.5% reduction, respectively. Also, P. lilacinus increased the shoot length and fresh weight of the root system by 229.0% and 476.46%, respectively. The most effective treatment in reducing root galls and egg masses of the nematode was Oxamyl. Bacillus thuringiensis increased shoot weight and root length and was the most effective treatment. Glomus macrocarpium was the least effective treatment as galls and egg masses. Glomus macrocarpium produced the lowest increase in root length and B. subtilis the lowest increase in root fresh and dry weights.
Archives Of Phytopathology And Plant Protection
An experimental study was carried out in pots to investigate the activity of Nemathorin, natural product and biopesticides against root-knot nematodes (RKNs) on tomatoes. Fosthiazate and abamectin proved to be the most effective treatments which suppressed the RKN population by 82.1%. Furthermore, arbuscular mycorrhizal fungus 2 (AMF2) was the superior treatment that reduced galls/root system followed by abamectin with the values of 72.5% and 67.2%, respectively. In addition, fosthiazate, cadusafos and crustacean2 gave the highest increase in the root length with the values of 55.8%, 54.6% and 54.6%, respectively. AMF2 was the most effective treatment which increases the root weight by 43.9%, while azadirachtin decreased the root weight by 12.2% compared to untreated check. AMF2, cadusafos and crustacean2 not only increased the shoot length but also increased the shoot weight. Azadirachtin recorded the minimum increase in shoot system length and weight.
JOURNAL OF PLANT PROTECTION RESEARCH
A pot experiment was carried out under greenhouse conditions to study the impact of the evaluated treatments namely abamectin, azadirachtin 0.15%, azadirachtin 0.03%, Bacillus subtilis, Pseudomonas fluorescens, Paecilomyces lilacinus and oxamyl against root-knot nematode (Meloidogyne incognita) on the tomato plants cv. Super strain B. The results indicated that the most of the tested treatments obviously reduced root galls and remarkably increase tomato plant growth characters significantly and egg masses on root system, as well as, juvenile’s numbers in the soil. P. lilacinus was the most effective treatment on both galls and egg masses achieving 88.23 and 76.94% reduction, respectively. While, less effective treatment was P. fluorescens achieving 57.53% galls reduction. Azadirachtin 0.03% was the least effective treatment giving 40.37% reduction of egg masses. The superior treatment that suppressed nematode populations was oxamyl recording (88.90%) followed by abamectin (78.69%) reduction. Moreover, azadirachtin 0.15% was the least effective treatment which recorded 60.15% reduction. On the other hand, plants free nematode recorded the highest plant parameters for shoot system length, fresh shoot weight, dry shoot weight and root system length with values of 24.15, 107.53, 211.59 and 46.17% increase, respectively. Azadirachtin 0.15% was the least effective treatment on shoot system length and fresh and dry shoot weight. While, oxamyl recorded the least increase in root system length estimated by 18.47%. B. subtilis recorded the highest increase in fresh root weight followed by P. fluorescens with value of 125.75 and 86.57%, consecutively. Vise versa, P. fluorescens was the superior treatment to increase the dry root weight by 68.14% followed by B. subtilis which recorded 35.40%. The least effective treatment in improving fresh root weight was azadirachtin 0.15% which recorded 54.85% increase. Regarding to dry shoot weight P. lilacinus and azadirachtin 0.15% were the least effective treatments with values of 8.85 and 2.66% reduction, respectively
Plant Pathology & Microbiology
Despite the usefulness of nematicidal compounds in agricultural practices, but it cause environmentally problems,which lead to seek about safe and alternative agents as tools to be used in the plant nematodes management programs.Abamectin is one of the suggested alternative biorational tool that belongs to avermectin group, which belong to macro cyclic lactones metabolites produced by a natural fermentation of the bacterium Streptomyces avermitilis. Abamectin mixture contains more than 80% avermectin B1a and less than 20% avermectin B1b. Meanwhile,abamectin used as an insecticide, acaricide and nematicide on vegetables, fruits and fild crops. On the other hand, neem oil is a vegetable oil pressed from the fruits and seeds of the neem tree, Azadirachta indica. The neem tree was recognized for its unique properties against insects, and in improving human health. It is grown in most tropical and sub-tropical areas. Its leaves, bark, and seed kernels extracts, or cake, can be utilized in phytonematodes management. Various components such as nimbin, nimbidin, azadirachtin, salannin, thionemon, and meliantriol occur in the seeds, leaves, and the bark of neem with high concentrations. The effect of neem against plant parasitic nematodes was noticed and recorded in many reports, as well as its insecticidal, fungicidal and bactericidal effiacy.