Vol 2 No 3 (1973)

Articles

  • XML | PDF | downloads: 62 | views: 80 | pages: 133-134
    Field trials of molluscicide WL8008 (N-tritylmorpholine) were carried out in Khuzestan, Iran. The liquid 2 (FX/28), a 16.5 w/v emulsifiable concentrate in tetrachloroethylene in concentrations of 0.25 ppm and 0.5 ppm was used against Bulinus truncatus and Lymnaea gedrosiana in standing and running water systems . Bio-assay tests and laboratory experiments were made parallel to the field trials. Only a few of the B.truncatus were affected by 0.25 ppm of N-tritylmorpholine, but L.gedrosiana proved to be more susceptible to the chemical and an almost complete kill of L.gedrosiana was achieved. A concentration of 0.5 ppm completely killed both B.truncatus and L.gedrosiana, but had no effect on egg-masses. N-trityl-morpholine may play an important part in future snail control projects, particularly on Lymnaea snails.
  • XML | PDF | downloads: 97 | views: 88 | pages: 145-155
    The paper contains the first report on the biology of snail-killing flies (sciomyzidae) in Khuzestan. It is based on field and laboratory studies conducted during November 1971 and April 1973, as well as field observations in May 1972, at the Dezful Medical Research Station. Additional biological information obtained during studies is given for Pherbellia fuscipes (Macaquart), P.grisescens (Meigen), Coremacera amoena (Loew), Knutsonia turkestanica (Hendel), Sepedon sphegea (Fabricius), S.s spinipes (Scopoli) and Colobaea iranica Knutson, together with their habitat distribution.
  • XML | PDF | downloads: 62 | views: 59 | pages: 156-162
    Anopheles culicifacies is the vector of malaria in southeastern part of Iran, India, West Pakistan and Ceylon. In 1959 the LC50 % DDT in the Panchmahal district of Gujarat state (India) had increased. DDT resistant population of A. culicifacies has been reported from West Pakistan, Burma and Iran. After application of DDT in 1959, the density of A. culicifacies decreased sharply. The susceptibility test carried out in 1963 showed that the LC50 was 0.5%.After DDT spraying, followed by Dieldrin, for about 10 years the density of A. culicifacies was so negligible that it was not possible to perform susceptibility tests. By April and May of 1973 the density of A.culicifacies in Saidabad, Khairabad and Hit in Baluchesten province, Southeast of Iran, increased to about 500 per shelter. The susceptibility tests carried out showed that A. culicfacies is resistant to DDT and susceptible to Dieldrin and Malathion.
  • XML | PDF | downloads: 105 | views: 131 | pages: 163-169
    Stool examinations of 402 inhabitants of 8 villages in and around an area near Zahedan, and 280 people who had emigrated from the rural area of Zabol, revealed the following: The prevalence of infection with Ascaris, Trichuris and Trichostrongylus was very low (less than 5%) in all areas surveyed, while the mean infection rates found for H.nana, hookworm and E.vermicularis (by stool examination only) were respectively 25.6%, 14% and 8% for villages in Zahedan and respectively 20.8% , 26% and 12% for the rural area of Zabol. The mean number of eggs of parasites found per gram of faeces was 400 for Ascaris and 1163 for hookworm. The only species of hookworm found was Ancylostoma duodenale, the mean worm burden of which was 18 among 20 cases treated. The species of Trichostrongylus expelled from treated cases were T. orientalis, T.colubriformis and T. vitrinus. The mean worm burden of this parasite was 11.Ninety percent of treated cases expelled E.vermicularis.