Premium
Relative toxicity of phosphine against the bean bruchid Acanthoscelides obtectus (Say) (Col., Bruchidae)
Author(s) -
Hasan M. M.,
Reichmuth C.
Publication year - 2004
Publication title -
journal of applied entomology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.795
H-Index - 60
eISSN - 1439-0418
pISSN - 0931-2048
DOI - 10.1111/j.1439-0418.2004.00850.x
Subject(s) - biology , toxicology , toxicity , phosphine , zoology , medicine , biochemistry , catalysis
The toxicity of phosphine against adult Acanthoscelides obtectus (Say) was studied over a range of concentrations, viz. 0.01, 0.0125, 0.015, 0.02, 0.04, 0.08, 1.0, 2.0, 3.0, 4.0, 5.0 and 6.0 mg/l and exposure periods, viz. 0.25, 0.50, 1, 2, 6, 12, 24 and 48 h at 25°C and 65% relative humidity. Results show that both the parameters exhibited significant effects on the mortality of A. obtectus . Data indicate that 100% mortality only occurred in A. obtectus when 1‐, 2‐ and 12‐h exposure times were involved in the respective highest individual ct product. The ct products decreased as the exposure times increased for both the mortality levels of 50 and 99%. The minimum ct products for 50 and 99% kill were 0.19 and 0.29 mg h/l, respectively, at an exposure of 12 h. The influence of thresholds on regression equations of the form c n t = k were 0.59 and 13.80 (mg/l) n h for the fixed concentration for 50 and 99% mortality levels, respectively while they were 0.45 and 12.45 (mg/l) n h for the six exposure periods for the same mortality levels.