Use of growth regulator of cytokinin type for enhancement and modification of herbicide activity.

The herbicidal action of Betanal Express (BPAM) on Chine jute (Abutilon theophrasti) weed was studied in the presence of a new plant growth regulator of urea type, N-phenyl-N-(1,2,4-triazol-4-yl)urea (PhenylTriazolylUrea, PTU). In the past years, Chine jute has become a major limiting factor in sugar beet production in the southern Russia due to its resistance to BPAM which is an essential herbicide widely used for sugar beet protection. When PTU was added to BPAM, the combination appeared to be more effective than the herbicide alone.

Novel formulation for enhancing efficiency of metribuzin.

The biological efficiency of systemic herbicide metribuzin in water dispersible granules (WG) and solution colloid concentrate (SCC) formulations was studied in field experiments. Metribuzin formulation in SCC state was prepared by the addition of a mixture of anionic and non-ionic surfactants and alkoxylated sorbitan esters as specific adjuvants. The ability of herbicide formulation containing Metribuzin in SCC state to provide increases in control of broadleaf and grassy weeds in comparison to WG was observed.

Novel formulation for enhancing efficiency of tebuconazole.

A novel formulation of tebuconazole in microemulsion state was prepared in this work. The microemulsion was formed due to the presence of a special system of surfactants, namely ethoxylated castor oil and fatty acid amides. Biological effect of suspension concentrate and microemulsion formulations of tebuconazole with the same concentration of active ingredient was investigated in the field experiments.

[Direct selection of Aspergillus terricola variants having different toxicity on a culture of fibroblasts].

A direct method is proposed to select less toxic mutants of Aspergillus terricola on a culture of fibroblasts. The conidia are first irradiated with UV, and then are used to grow colonies on the glass surface of tubes or flasks containing medium 199. The cells of fibroblasts are added thereupon and the two cultures are being grown together for 24--48 hours.