Efficacy of Fluorinated Nematicides for Management of Root-knot Nematodes in California Processing Tomatoes.

California is the primary US producer of processing tomatoes. After decades-long excellent protection against the common tropical spp. , , and (root-knot nematode: RKN) by -resistant tomato cultivars, resistance-breaking RKN populations are spreading throughout the San Joaquin Valley.

Host status of melon, carrot, and -susceptible and -resistant cotton, cowpea, pepper, and tomato for from California.

The host status of carrot, melon, and susceptible and resistant cultivars of tomato, cotton, cowpea, and pepper for a California isolate of the peach root-knot nematode was determined in greenhouse pot experiments. It was compared to a race 3 isolate of . Melon was an excellent host for both isolates and roots were heavily galled after the 8-week trial.

A Comparison Between and from California on Susceptible and Resistant Sweetpotato Cultivars.

The reproduction and ability to cause root-galling of a California isolate of the peach root-knot nematode was evaluated on seven sweetpotato () cultivars and compared with an race 3 and an -gene resistance-breaking isolate. The susceptible tomato () cultivar Daniela and the -gene-carrying resistant cultivar Celebrity were included as controls. Repeated trials were done in pots in a nematode-quarantine greenhouse at the University of California, Riverside.

Control of in sweetpotato with fluensulfone.

In California, sweetpotato is mostly grown on light sandy soils in Merced County. Root-knot nematodes ( spp.) can reduce sweetpotato yields and quality.

Response of Resistant and Susceptible Bell Pepper (Capsicum annuum) to a Southern California Meloidogyne incognita Population from a Commercial Bell Pepper Field.

To determine the presence and level of root-knot nematode (Meloidogyne spp.) infestation in Southern California bell pepper (Capsicum annuum) fields, soil and root samples were collected in April and May 2012 and analyzed for the presence of root-knot nematodes. The earlier samples were virtually free of root-knot nematodes, but the later samples all contained, sometimes very high numbers, of root-knot nematodes.

Evaluation of 31 potential biofumigant brassicaceous plants as hosts for three meloiodogyne species.

Brassicaceous cover crops can be used for biofumigation after soil incorporation of the mowed crop. This strategy can be used to manage root-knot nematodes (Meloidogyne spp.), but the fact that many of these crops are host to root-knot nematodes can result in an undesired nematode population increase during the cultivation of the cover crop.

Control of root-knot nematodes on tomato in stone wool substrate with biological nematicides.

The efficacy of four biological nematicides on root-galling, root-knot nematode (Meloidogyne incognita) reproduction, and shoot weight of tomato (Solanum lycopersicum) grown in stone wool substrate or in pots with sandy soil was compared to an oxamyl treatment and a non-treated control. In stone wool grown tomato, Avid® (a.i.

The potential of five winter-grown crops to reduce root-knot nematode damage and increase yield of tomato.

Broccoli (Brassica oleracea), carrot (Daucus carota), marigold (Tagetes patula), nematode-resistant tomato (Solanum lycopersicum), and strawberry (Fragaria ananassa) were grown for three years during the winter in a root-knot nematode (Meloidogyne incognita) infested field in Southern California. Each year in the spring, the tops of all crops were shredded and incorporated in the soil. Amendment with poultry litter was included as a sub-treatment.

Effect of Broccoli (Brassica oleracea) Tissue, Incorporated at Different Depths in a Soil Column, on Meloidogyne incognita.

Brassicas have been used frequently for biofumigation, a pest-management strategy based on the release of biocidal volatiles during decomposition of soil-incorporated tissue. However, the role of such volatiles in control of plant-parasitic nematodes is unclear. The goal of this study was to determine the direct localized and indirect volatile effects of amending soil with broccoli tissue on root-knot nematode populations.

Effect of Three Plant Residues and Chicken Manure used as Biofumigants at Three Temperatures on Meloidogyne incognita Infestation of Tomato in Greenhouse Experiments.

Plant residues of broccoli, melon, and tomato with or without addition of chicken manure were used as biofumigants in two pot experiments with Meloidogyne incognita-infested soils. The efficacy of these biofumigants in controlling M. incognita infestation in susceptible tomato bio-assay plants was studied at soil temperatures of 20 masculine, 25 masculine, and 30 masculineC.

Use of Cucumis metuliferus as a Rootstock for Melon to Manage Meloidogyne incognita.

Root-knot nematode-susceptible melons (Cantaloupe) were grown in pots with varying levels of Meloidogyne incognita and were compared to susceptible melons that were grafted onto Cucumis metuliferus or Cucurbita moschata rootstocks. In addition, the effect of using melons as transplants in nematode-infested soil was compared to direct seeding of melons in nematode-infested soil. There were no differences in shoot or root weight, or severity of root galling between transplanted and direct-seeded non-grafted susceptible melon in nematode-infested soil.

Effects of Selected Marigold Varieties on Root-knot Nematodes and Tomato and Melon Yields.

Field experiments were conducted at two sites in California to evaluate the effects of marigold genotypes Tagetes patula var. Single Gold and Tagetes hybrid var. Polynema on Meloidogyne incognita infestation, root-galling, and yields of tomato grown immediately after marigold.