The susceptibility of the immature and adult stages of Sitophilus granarius to phosphine

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Abstract

A concentration of 4 mg/l. of phosphine applied for 8 hr at 25°C permitted a considerable survival of the developmental stages of Sitophilus granarius (L.). Eggs of 3–4 days old were very tolerant and pupae even more so but larvae were very susceptible. A concentration of 1 mg/l. applied for 32 hr completely killed all stages except pupae. The most tolerant eggs were 2–4 days old. At 0·5 mg/l., pupae were again the most tolerant stage and eggs were most tolerant at 1–2 days old. At 0·3 mg/l. or less the majority of eggs were killed during the fifth day of development irrespective of their age at the start of fumigation, but over half were dead by 4 days old at 0·4 mg/l. and about a third survived beyond the sixth day at 0·05 mg/l. It is only at these latter concentrations at these ages that mortality of eggs was clearly related to dosage.

The physiological age range of pupae in samples was more dispersed. Pupae were most tolerant to phosphine at about 32 days old. From 5 to 7 days were needed for complete mortality at concentrations of 0·1–0·05 mg/l.

Adults were very susceptible to phosphine, all being killed by 8 hr at 1 mg/l. which permitted survival of some larvae. Freshly emerged adults were the most tolerant; older adults were very susceptible, at 1 month old being killed by 4 hr at 1 mg/l. and 3 days at 0·01 mg/l. Insects surviving fumigation as larvae or pupae usually laid fewer eggs than controls though their longevity was unaffected. Those surviving fumigation as eggs were not adversely affected. There is a possibility that some individuals surviving, as eggs or pupae, a fumigation causing very high mortality may lay more rapidly than controls.

References (11)

  • G. Surtees

    Observations on some effects of temperature and isolation on fecundity of female weevils, Sitophilus granarius (L.) (Coleoptera, Curculionidae)

    Entomologia exp. applic.

    (1964)
  • R.B. Bruce et al.

    Phosphine residues from Phostoxin-treated grain

    J. agric. Fd Chem.

    (1962)
  • D.J. Finney
  • H.K. Heseltine et al.

    The use of aluminium phosphide tablets for the fumigation of grain

    Milling

    (1957)
    H.K. Heseltine et al.

    The use of aluminium phosphide tablets for the fumigation of grain

    Milling

    (1957)
    H.K. Heseltine et al.

    The use of aluminium phosphide tablets for the fumigation of grain

    Milling

    (1957)
    H.K. Heseltine et al.

    The use of aluminium phosphide tablets for the fumigation of grain

    Milling

    (1957)
    H.K. Heseltine et al.

    The use of aluminium phosphide tablets for the fumigation of grain

    Milling

    (1957)
    H.K. Heseltine et al.

    The use of aluminium phosphide tablets for the fumigation of grain

    Milling

    (1957)
  • R.W. Howe

    The random sampling of cultures of grain weevils

    Bull. ent. Res.

    (1963)
There are more references available in the full text version of this article.

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