Effectiveness of an extended agri-mycin-17 spray schedule against fireblight
1969
Shaffer, W.H. | Goodman, R.N.
Inadequate rainfall seems to modify to influence of temperature conditions that would favor severe epiphytotics of the blossom blight phase of fireblight. The use of four Agri-mycin sprays provided significantly more control of twig blight than did two sprays. The use of six additional sprays reduced the incidence of twig blight, apparently by maintaining an inhibitory antibiotic level in sprayed tissue. The antibiotic level in the fruit taken from treated trees was below the 0.25 mu/ml tolerance set by the Food and Drug Administration as early as 4 weeks after the last spray. There was no detectable antibiotic residue in fruit at the time of harvest; however, antibiotic activity was still detectable in leaves.
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