1968 Volume 37 Issue 1 Pages 73-78
This studies were conducted to obtain some informations about properties of a selective herbicide, CMMP (Solan) for tomatoes.
(1) Tomato plants were susceptible for CMMP at 3 to 5 leaves stage, but increased in tolerance with age advanced and found to be more tolerant at 7 to 8 leaves stage.
In general, tomato plants grown in the greenhouse were more susceptible than field grown plants.
(2) The differences in susceptibility for CMMP were not recognized among the six tomato cultivars, Hikari, Sekaiichi, Fukuju No. 2, Kurihara, Best of all and Ponderosa.
(3) No injury to tomato plants were observed after spraying CMMP at flowering time and both yield and quality of tomatoes treated with CMMP were almost the same that of non-treated plants (weeding by hands).
(4) Herbicidal activity of CMMP at high temp. (30±3°C) was more effective than low temp. (20±3 °C).
(5) Effect of rainning after spraying CMMP was observed on herbicidal activity and it was confirmed that no rainning time is necessary for 3 hours after spraying CMMP to susceptible plants (such as panic grass of 5 to 10cm in heigh) and for 6 to 24 hours to tolerant plants (such as panic grass of 40 to 45 cm in heigh).
(6) The relation between the effect of CMMP and light intensity was more important, and high intensity of light during treatment with CMMP accerelated weeding much more than low light intensity.
(7) Effect of CMMP as soil treatment was proved on weeding of crucifer but not practical, and residual activity in soil continued for about 20 days.
CMMP was much more effective when it was sprayed directry to leaves and stems than when used as soil treatment.