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Solar Heat: It`s Use for Controlling Seed Born Fungal Infection of Wheat

MAI Khan
SSO
Plant Pathology Division, BRRI

MS Hossain
PSO
Training Division, BRRI

Abstract/ Executive Summary:

The effectiveness of solar heat in controlling seeds borne fungal infections of wheat was tested by drying of seeds on concrete floor, brown paper and mixing with sand (50:50) for 0, 4, 8 and 12 hours. It was observed that seeds dried with sand mixture always yielded lowest number of seed borne infections of all the fungi followed by concrete floor and brown paper. Reduction rate of fungi achieved in all the treatments differed significantly from that of control. Twelve hours was the best period in inhibiting the seed borne infections. However, in some cases both 12 and hours treatments behaved equally. Reduction of total seed borne infection infection and increase in seed vigour positively correlated with increase in dry period. Therefore, to minimize the seed borne the seed borne infections it would be advisable to use seed dried mixture for 12 hours under direct solar heat.

Keywords: Solar heat, Control, Seed borne infections, Wheat

Location: BAU, Mymensingh

Start Date: 00-00-1998

End Date: 00-00-1999

Program Area: Pest Management

Commodity: Wheat

Objectives:

To observe the effectiveness of solar heat on seeds in controlling the major seed borne fungals pathogens of wheat .
To identify the congenial solar heat treatment methods and length of drying period.

Methodology:

The experimental pertaining to the present investigation were carried out in the laboratory and glass house of the department of plant pathology, Bangladesh Agricultural University Mymensingh, Bangladesh during the cropping season 1998-1999 seed sample of wheat (var.Kanchan) were collected from a farmer of Boyra village near Bangladesh Agricultural University (BAU) Campus, which was freshly harvested. The seeds were then dried trough solar heat treatment by three different ways viz. (M₂) spreading the seed thinly on brown paper(M₃) seed mixed with equal volume of coarse sand (50:50) and (M₁) seeds just spreading on concrete floor. Around 300 g seed samples were taken and divided into 3 groups 4 (T₁) 8(T₂) and 12 (T₃) hours drying. Then the seeds were kept under direct solar heat for 4 hours of drying (11:00 hrs to 15:00 hrs). In case of 8 and 12 hours drying, the seeds were dried as above consecutively for 2nd day and 3nd day, respectively. During drying time, both the air temperature and temperature generated within the seeds were recorded. After drying, all the seed samples were assayed for seed-born fungal pathogens following blotter method (ISTA, 1976).

vigour index of the seeds were determined on the basis of seed germination and it was calculate using the following formula (Agarwal, 1996).

No. of seeds germinated at 1st count No. of seeds germinated at 2nd count

Vigour Index (VI) = ------------------------------------------ + ---------------------------------------------

Days of 1st count Day of 2nd count

No. of seeds germinated at last count/Day of last count

The collected data of different parameters were analyzed statically using MSTAT-C package programme. The significance of the difference among the means was computed by least significant Difference (LSD)

Source of Information: Pakistan Journal of Biological Science, 5(4):449-451, 2012

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Seeds dried with sand mixture always yielded lowest number of seed borne infections of all the fungi followed by concrete floor and brown paper. Twelve hours was the best period in inhibiting the seed borne infections. Reduction of total seed borne infection infection and increase in seed vigour positively correlated with increase in dry period. Therefore, to minimize the seed borne the seed borne infections it would be advisable to use seed dried mixture for 12 hours under direct solar heat.

Knowledge Management: Journal