ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Effect of combining vegetable oil with pirimiphos-methyl for protection of stored wheat against Sitophilus granarius (L.).

Tembo, E.; Murfitt, R. F. A.;

Journal of Stored Products Research Year: 1995 Vol: 31 Issue: 1 Pages: 77-81 Ref: 17 ref.

1995

บทคัดย่อ

Vegetable oils (groundnut, rapeseed and sunflower) at 10 ml/kg were tested alone and in combination with pirimiphos-methyl at a half, a third or a quarter recommended dosage against Sitophilus granarius in wheat grain. All bioassays were conducted at 20 and 30 deg C. All treatments caused significant mortality compared to controls (untreated grain). Treatments with vegetable oils combined with pirimiphos-methyl at half the recommended dose were as effective as pirimiphos-methyl at the recommended dose, both achieving complete control with 24 h of exposure to freshly treated grain. The same treatments remained effective after 90 days of storage. The vegetable oils alone achieved considerable mortality (60-80%) within 14 days and there was little difference between the 3 oils in their effect. Pirimiphos-methyl activity was dose dependent. When applied alone, the vegetable oils and pirimiphos-methyl at reduced rates were less effective than combined treatments. The toxicity and persistence of treat

ments did not vary significantly between 20 and 30 deg C. Viability and water absorption were reduced by the oil treatments, but particle size distribution after milling was unaffected. It is concluded that treatment of grain with pesticide/vegetable oil mixtures could have important practical implications for parts of the world where pesticides are expensive or in short supply.