Tolerances of California nectarine cultivars to methyl bromide quaratine treatments
1989
Harvey, J.M. | Harris, C.M. | Hartsell, P.L.
The tolerance of six cultivars of nectarine [Prunus persica (L.) Batsch var. nectarina (Ait.) Maxim.] to methyl bromide (MB) quaratine treatments was determined. A treatment, 48 g MB/m3 for 2 hr at 21C, which controlled codling moth [Cydia pomonella (L.)], caused no significant phytotoxic response in any of the cultivars. The threshold for injury at the above time and temperature was approximately 64 g MB/m3 in 'Summer Grand', 'May Grand', 'Fantasia', and 'Firebrite'; between 48 and 64 g MB/m3 in 'Red Diamond'; and between 80 and 96 g MB/m3 in 'Spring Red'. All fumigated nectarines were significantly firmer than the control fruit after storage for 7 days at 2.5C, but subsequently ripened satisfactorily; soluble solids content of the fruit was not affected by the fumigations used in this study. Inorganic bromide residues in fruit treated with the 48 g/m3 dosage at 21C or above ranged from 3.5 to 7.2 ppm, well below the U.S. tolerance of 20 ppm. Organic bromide residues were less than 0.01 ppm within 48 hr after treatment.
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