Quick Lime is an Effective Rice Grains Protectant Against the First Instar Larvae of Sitotroga cerealella (oliver) (Lepedoptera: Gelichiidae) in Stored Rice Grains under Laboratory and Store Conditions.

Document Type : Original Article

Authors

1 Plant Protection Research Institute, ARC, Dokki, Giza, 12618 Egypt

2 Plant Prot. Dep., Faculty of Agriculture and natural Resource, Aswan Univ., Egypt

Abstract

Laboratory and store assessments were carried out to investigate the efficiency of the quick lime as natural component with non chemical residues and harmful side effects. Great energy produced when acts with water insect gut, caused death. The two pathogenic fungal strains Metarhizium anisopliae (Metsch) and Beauveria bassiana (Balsam) were tested on the first instar larvae of Sitotroga cerealilla on stored unhusked rice grains udder laboratory and store conditions. The quick lime powder was used at the quantities of 100, 150 and 200 g. / kg. rice grains Giza178,and the two fungal pathogenic strains, each at the concentrations of 1x108, 1.25 x108 and 1.5 x 108spores/ml. Malathion 5% super dust was applied at the quantities of 0.125, 0.250 and 0.5 g. / kg. infestation free of unhusked rice grains. Higher mortality percentages were obtained with quick lime at the quantity of 200 g. / kg. was 97.75 followed by Malthion super dust 82.75 % at the quantity of 0.5 /kg. on rice grains after 72 h. M. anisopliae was the third at the concentration of 1.5 x 108 spores / ml. was 81.75 % while B. bassiana was the least at 1.5 x 108 spores / ml. was 75.5 % after 7 days in the laboratory conditions. In the store conditions, quick lime also achieved higher mortality percentage at the concentration of 300 g / kg. and the average mortality percentage was 91.46 followed by Malathion 85.41% at 1.0 g / kg.. M. anisopliae and B. bassiana achieved 71.27 and 61.39 %, respectively.
Quick lime powder and the insecticide Malathion 5% super dust represents quick and higher mortality percentages after 24, 48and 72 h. in the laboratory while M. anisopliae has considerable mortality percentages and B. bassiana was the least mortality percentages after 3, 5 and 7 days.

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