A Consideration on the Roguing of Diseased Plants for Maize Downy Mildew Control

[摘要] On the infection of Maize downy mildew, if it is supposed that the infected plants do not act on the other healthy plants within same hill as the contagious source, the infection rates on hill base are theoritically shown by the expansion of formula (p+q)n, where p, q and n stand for the infection rate on individual base, 1-p and number of plants per hill, respectively.On the data obtained from the different experiment station, using the different varieties and hill spacing, the observed infection rates on hill base were compared with the expected ones calculated from the formula.It was proved that both rates were coincident well as shown in Tables 1, 2, 3 and 4.From these facts, it was concluded that the supposition mentioned above would hold good, namely, the disease would not be transmissible from the infected plants to the healthy plants within the same hill, or it would be very few if transmitted.Lastly, based on the results, the effect of roguing of diseased plants was discussed from a viewpoint of Maize downy mildew control.

[学科分类] 农业科学（综合）