Pesticide residues and greedy scale control on kiwifruit

Abstract

Experimental sprayings of kiwifruit vines with azinphos-methyl, diazinon, and omethoatc were carried out in 1973 and with azinphos-methyl in 1974. Repeated azinphos-methyl <::pplications gave virtually scale-free leaves and fruit at loarvest. Residues of azinphos-methyl [Illd omethoate were unusually high immediately after spraying (up to 18 mg/kg and 11 mg/kg respectively) and residues from some treatments remained above the relevant New Zealand maximum residue limits (MRL) (2 and 0.5 mg/kg) for in excess of 5 weeks. Diazinon residues were lower and decayed to below the New Zealand MRL within 10 days. The fUrface hair on the fruit contributed significantly to the high azinphos-methyl residues.

Residues of phosmet on kiwifruit

“…This is illustrated by the magnified residue at the higher rate of treatment. The relatively high residue deposit, the surface location of the deposit, and the very slow decay rates are findings similar to previous observations using azinphos-methyl and omethoate on kiwifruit (Love & Ferguson 1977).…”

“…This extraction procedure has been previously found satisfactory for the organophosphorus pesticides azinphos-methyl, diazinon, and omethoate on kiwifruit. (Love & Ferguson 1977).…”

An assessment of the quarantine risk of armoured scale (Hemiptera: Diaspididae) fruit infestations on kiwifruit

“…Received 1 September 1992; accepted 8 March 1993 (Sale 1972(Sale , 1974Love & Ferguson 1977;Steven 1990). Export standards are consequently extremely rigourous and require all scale infested fruit to be removed during the grading and packing process.…”