Show CONTROL OF SCALE INSECTS spraying may be bone at two dif ferent periods of year and for different purposes tit alie control of scale insects of all kinds is chiefly by spraying and this operation may lie be carried on at two periods of the hie year andhor and tor two entirely different purposes in one case tile the spraying Is done dohe when the trees tire arc not lit in fo foliage linge that is I 1 in 11 tile the late autumn or early spring and these sprays are known as dormant sprays because of the dormant condition of 0 the treis trees |