Zineb and ethylene thiourea (ETU) residues were monitored in Bartlett pears after spraying with zineb (5.04 kg a.i./ha). Zineb dissipated seven times faster in the first 10 days after application than in the subsequent days of the study; ETU residues ranged from 0.02 to 0.01 mg/kg over the 21 day trial. A 3–6% conversion of ethylene‐bisdithiocarbamate to ETU was found upon boiling treated pears. Analysis of randomly selected commercially canned pears and baby food pear purée showed no zineb residues but LT0.05 mg ETU/kg was present in four of the six samples of baby food.
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Ripley et al. (1977) studied this question.
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