CHEMICAL CONTROL OF THE CYST NEMATODE, HETERODERA TRIFOLII ON MINIATURE CARNATION
A trial was carried out in a commercial greenhouse with miniature carnation of the variety Red Baron.
The fumigants DD-methylisothiocianate, Dazomet and Metham sodium applied to the soil before planting were used alone and in combination with three non fumigant nematicides Aldicarb, Carbofuran and Oxamyl, at three different times for the control of the nematode.
The fumigants were more efficient than the non fumigant nematicides for the reduction of the population of the nematode in the soil. The best treatment was DD-methyl-isothiocianate with a 52 % reduction of the viable cysts population and 38 % reduction of the larvae population in the soil, a reduction of 15 days in harvesting time, a 9 % increase in yield and 19 % increase in net income, as compared with the untreated control.
Among the three non fumigant nematicides, the best treatments were Aldicarb and Carbofuran applied at planting time. Oxamyl applied 30 days after planting showed similar results.
The combination of the fumigants with the non fumigant nematicides did not improve the nematode control, yield and quality of the flowers. Combination of the two types of nematicides increased the production costs.