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- Author or Editor: A. H. Lange x
Scions from ‘Solo’ papaya trees of normal size grafted on dwarf ‘Solo’ stocks resulted in trees with less vigor. Flowering and fruit production occured lower on the stem. The total quantity of fruit was smaller than on normal ‘Solo’ trees.
Dwarf ‘Solo’ scions grafted on normal ‘Solo’ stocks resulted in vigorous trees flowering and producing fruit higher on the stem; there was also more fruit, with less crowding, than on dwarf ‘Solo’.
Weed competition reduced the growth of young peach and plum rootstoeks. Heavy sprinkler irrigation increased the phytotoxicity of simazine to young Prunus rootstoeks. Recovery from severe foliar injury occurred during the season and normal growth resulted at the lower rates of simazine. No detrimental residual effect on tree growth was noted during the following season.
The control of annual weeds in young prune orchards increased growth. The degree of foliar expressed phytotoxicity did not result in decreased tree growth. Simazine gave long lasting weed control and the most foliar symptoms on prunes, but superior tree growth. Simazine and dichlobenil produced more foliar symptoms than diphenamid, but less indication of growth reduction.
A number of pre-emergence soil residual herbicides were tested at 2 locations on varieties of young peach, plum, cherry, pear and walnut rootstocks. The greatest variation in response resulted from differences in location. Important differences in varietal response were also obtained with the various herbicides in light soils. Simazine appeared sufficiently safe to trees in heavier soil but gave variable weed control. Diuron gave about the same degree of weed control but more safety than simazine on young trees. Of the uracil herbicides tested, DP-733 was the least toxic to the fruit tree species tested, while bromacil and isocil were generally the most toxic, except to peach trees. Of the commercial uracil herbicides, only DP-732 (terbacil) was of sufficient interest for further study.