H3-FV-19-D flender uae Helical speed reduction gearbox H3

Flender/Flender Gear Units/Helical speed reduction gearbox H3

ess as they become absorbed by dust and by abrasion during cleaning opera-tions (. To control the active yers, space treatment with dichlorvos (DDVP) is ap-plied. In some countries diclorovos resin strips, which slowly emit insecticide vapor, areused in grain stores. Diclorovos has both contact and fumigant action and adult moths are quickly knocked down by the chemical. To reach inaccessible places in at storage and warehouses, an aerosol treatment or fogging will be needed. In the tropical countries direct mixing of insecticides with the grain is generally not adopted. However, in the industrialized countries admixture of approved insecticides with the food grains at speci- ed levels are still permitted so that the bulk-stored grain may remain protected from insect attack during the entire storage period. Malathion (8 ../), pirimiphos-methyl(4 /), chlorpyriphos-methyl (2.5 /), biorosmethrin (1.5 /), and dichlorvos (1 /)are some of the insecticides used in different countries. Malathion has been used for more than 3 years as grain protectant and for prophylactic spray on storage structures. Insect resistance to malathion is common problem in most parts of the world; therefore, it hasbeen largely replaced by more potent compounds (. Chlorpyrifos-methyl and piri-miphos-methyl are also organophosphorus insecticides, with broad-spectrum activity.Some strains of . dominica are, however, tolerant to them. Both compounds are more persistent than malathion. Methacriphos is potent organophosphorus insecticide showing very good effect under temperature climatic conditions. Unlike other organophosphorus compounds, it has appreciable toxicity against . dominica . Among the pyrethroids, delta- methrin and bioresmethrin are important. Both are effective against . dominica . Delta- methrin remains effective on treated surfaces for longer period even under highly humidconditions. Sitophilus spp. are generally tolerant to deltamethrin. comprehensive review on the propert