Evaluation of DiTera Against Plant-parasitic Nematodes in Hawaii
Management of plant-parasitic nematodes in Hawaii’s subtropical environment is a challenge. Nematode management tactics such as the use of resistant cultivars, crop rotations or fallow periods are impractical or ineffective against the range of nematodes found in Hawaii. However, most nematicides are hazardous to the environment. Methyl bromide is being phased out, 1,3-Dichloropropene is a suspected carcinogen, aldicarb leaches into the groundwater and the remaining nematicides are organophosphates or carbamates that face evaluation under the Food Quality Protection Act and could eventually be eliminated. They include fenamiphos, ethoprop and oxamyl. This project tests the effectiveness of a biologically derived nematicide developed by Abbot laboratories, DiTera, in three different systems. Two field trials will be done on pineapple in Maui, a field trial will be done on cabbage in Kula, Maui, and a demonstration plot comparing DiTera to fenamiphos was to be installed at the Ala Wai golf course in Honolulu.
Project goals and objectives
Goal is to familiarize Hawaii's agricultural community with DiTera, a biologically derived nematicide with reduced environmental impacts
1) Establish two field tests in pineapple to demonstrate the efficacy of DiTera.
2). Establish a field test in cabbage to demonstrate the efficacy of DiTera.
3). Install a demonstration plot on the Ala Wai golf course to emonstrate the efficacy of DiTera.
: DiTera was as effective as other treatments (Sincocin and Plantation) in the pineapple trials. The DiTera treatment had slightly more size 10 fruit than the other treatments. The higher rate of DiTera (30 lb/acre) had larger plants and fewer discarded fruit than any other treatment. Fruit size, however, was largest in the lower rate of DiTera (20 lb/acre). In the cabbage trial, DiTera was tested at 20 lb/acre against Telone II (24 gal/acre) and Nemacur (1 ˝ lb/acre). More heads were harvested in the DiTera treated plots than in the other plots. However, average cabbage head weights were greatest in the Telone II treated plots. Final nematode populations in the soil were greatest in the plots treated with Nemacur. A golf course trial was set to run in Hilo, Hawaii testing DiTera against a granular Mocap treatment but the cooperator was unable to secure the Mocap and the trial was never installed. A field tour was held on Maui with over 50 industry observers and, as a result, Maui Land and Pineapple Company is conducting a larger scale test of DiTera for nematode control on their plantation. A field day was also held for cabbage growers and many have requested additional information on DiTera.
Data not required at time of project