Residual efficiency of pirimiphos-methyl and malathion against trogoderma granarium, events on different types of sack's fibers under natural conditions in Iraq

Pirimiphos-methyl 700 mg/m[2], ranked the first in efficient persistance followed by 500 mg/m[2], whereas 300 mg/m[2] of this insecticide was comparable with 700 mg/m[2] malathion. Results indicate that pirimiphos-methyl might be a successful alternative to malathion resistant larvae of Khapra beetle. However, ecological factors such as temperature may interfere with the toxicity of pirimiphos-methyl. As for containers, poly vinyl chloride fibers gave excellent kill till seven months storage which was comparable with heavy cotton and paper layer while the least residual efficiency was exhibited on jute. Nevertheless, pirimiphos-methyl or malathion with the least dosage can be used successfully on any sort of the forementioned fibers including jute for beetle-free short-term storage of two months

Malathion and pirimiphosmethyl against three species of stored product insects, vectors of tapeworms, on different types of sacks' fibers

The susceptibility of adults Tribolium castaneum, Tribolium confusum and 4th instar larvae of Trogoderma granarium, vectors of Tapeworms, to malathion and pirimiphos-methyl was determined by direct exposure to four types of treated disks of sacks. T. castaneum ranked the first in susceptibility to both malathion and pirimiphosmethyl followed by T. confusum then Tro. granarium on bases of LC[50] and LC[95] values. T. castaneum showed higher susceptibility when exposed to p.v.c. sacks treated with malathion or pirimiphos-methyl on the basis of LC[50] value. Based on both LC[50] and 95 values, T. confusum when exposed to pirimiphos-methyl proved to succumb more on p.v.c. disks, also with p.v.c. and paper layers surfaces treated with malathion. The same results were observed with T. granarium on malathion treated p.v.c. disks and pirimiphos-methyl treated paper layers. All tested insects tolerated the two insecticides on jute compared with other exposure surfaces

Susceptibility of four species of stored product insects, vectors of tapeworms to four organophosphorus insecticides

The susceptibility of adults Tribolium confusum, Tribolium castaneum, Sitophitus granarius and 4th instar Larvae of Trogoderma granarium, vectors of tapeworms, to Baythion Fenthion, Folithion and Diazinon was determined by direct exposure to treated disks of jute. As the tested insects succumbed evidently to Baythion in addition to its lower mammalian toxicity compared with Malathion the former may be considered in replacing the latter for potential, direct spray and residual surface applications