Informatics Publishing Limited

J. Jayaraj ¹, R. Ramabadran ¹

Affiliations
1 Plant Pathology Department, Annamalai University, Annamalai Nagar 608 002, Tamil Nadu, IN

Abstract

Three commonly used soil insecticides viz., BHC, phorate and carbofuran meant for the control of soil borne pests were studied for their in vitro influence on the growth, sporulation and cellulase production by Trichoderma harzianum. The insecticides were tested at 5, 10,50, 100 and 500 ppm concentrations. Among the insecticides, phorate and carbofuran caused maximum reduction of mycelial biomass. Sporulation was strongly inhibited by BHC when compared to other insecticides. The production of cellulases was drastically reduced by incorporation of  phorate.

Keywords

Cellulase Production, In Vitro Growth, Soil-Insecticides, Sporulation, Trichoderma harzianum.

Full Text

   

J. Jayaraj ¹, R. Ramabadran ¹

Affiliations
1 Plant Pathology Department, Annamalai University, Annamalai Nagar 608 002, Tamil Nadu, IN

Abstract

The study was taken up to evaluate cheaper organic substrates for the mass multiplication of Trichoderma harzianum with and without nutrient additives. Out of 7 organic substrates tested, pigeonpea husk was found to be the best followed by tapioca waste (after starch extraction) and pressmud. Addition of urea reduced the multiplication, whereas ammonium sulphate enhanced the colonization and propagule number of T. harzianum.

Keywords

Additives, Mass Multiplication, Organic Substrates, Trichoderma harzianum.

Full Text

   

S. Karpagavalli ¹, R. Ramabadran ¹

Affiliations
1 Department of Plant Pathology, Annamalai University, Annamalai Nagar-608 002, IN

Abstract

Manangement of soil-borne pathogens by using biocontrol agents is an efficient and long term method. The major problem of applying antagonists to soil is their inability to become established in the ecosystem and overcome the resistance of soil microflora to the introduction of new micro organisms (Alexander, 1971).

Keywords

Tomato, Damping-Off, Trichoderma harzianum, T. viride.

Full Text