Ophiobolus patch disease developed rather quickly on young bentgrass turf after an initial methyl bromide fumigation. The disease occurred at random in 1961, but generally was much worse on plots receiving 9.8 kg of N per 100 m3 per season, regardless of P and K levels, than on plots receiving less or no N. However, by 1964, Ophiobolus patch was much more severe in the 5.9 kg of N plots than in those receiving 2.9 or 9.8 kg of N. Phosphorus had little effect on the disease in 1961, but by 1964 plots treated with 0.86 kg of P had only 15% as much infection as those receiving 0 P. Potassium exhibited a suppressing effect on the amount of disease throughout the experiment regardless of the P level. There was about five times as much disease in the 0 P and 0 K plots in 1964 as in the 0 P and 1.6 kg of K plots at all N levels. Interactions between P and K probably account for some of this difference, since this does not occur when P is added.

Data from thesis in partial fulfillment of requirements of M.S. degree program.

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Ethylene hastens the ripening of fruits and is sometimes considered to be a ripening hormone (1). It also can regulate the flowering of bromeliads (2) as well as hasten deterioration of certain cut flowers (3). We are reporting accelerated flowering of bulbous iris after treating the bulbs with ethylene.

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