1. The fruit paper bags which have been treated with Uspulun are quite effective for the prevention of pear black spot disease not only in the year of this preparation but also in the following year. 2. Bordeaux mixture sprayed on pear leaves shows such an effect that germinating percentage of spores of Alternaria kikuchiana was 40∼50% after 11∼12 days. And effects of the following chemicals were as follows: SR-406 after 8∼10 days, Manzate 5∼7 days, OB-21 and Dithane about 5 days after had a germinating percentage of 50%. Uspulun had a remarkable inhibiting power on germination on the day spray was executed, but the effect will be los markedly aftter two days from spray. 3. Great differences couldn't be seen among 800:1, 1000:1, 3000:1 Uspuluns, concerning rapid decreasing tendency of the inhibition of the spore germination after spraying of Uspulun on leaves. 4. Decreasing of the inhibition of spore germination on slide glass are similar to the case of leaves. However, the decreasing tendency is by far the more remarkable under the direct sunlight than in the shade. The decreasing tendency on a slide or a leaf is in proportion to the lapse of time, say 6, 8 or 30 hours. 5. Uspulun and Ceresan emulsion (experimental spray) will lose almost all their inhibiting power to spore germination in 4 hours after spray under the direct sunlight, but wettable Ceresan (experimental spray) won't lose the power even after 24 hours. 6. After dipping in Uspulun liquid, unhulled rice seed were inoculated with such fungi as Alternaria kikuchiana and Ophiobolus miyabeanus and then the inhibition of conidia germination investigated. It was clarified that the inhibiting power on the surface rapidly decreased as the time goes on after dipping. In this case mercury itself was clearly demonstrated even after 144 days. 7. Spray effect was similar in both cases of pot and field experiments, and the mixture of Bordeaux and Uspulnn was best, and the alternately sprayed plot of the both liquids, Uspulun calcium stand in order of efficacy. 8. According to inoculating test of Alternaria kikuchiana upon a young shoot, Uspulun liquid was most effective, and SR-406, Bordeaux, OB-21, Dithane, Manzate, etc. came next in efficacy. And a special relation wasn't discovered between the time elapsed after the Uspulun spray was practised and degree of infection. 9. Not with standing the rapid decrease of inhibition of spore germination on leaves, it may be said many interesting problems still remain in the future in relation to Uspulun which has a remarkable control against infection in the final stage.
A destructive fungous disease of soybean, Glycine max (L.) MERRILL., “Nemuri-Byo” (Soybean Blast) found in Kyushu was described. Both summer and autumn varieties were affected being formed superficial brown obscure spots or streaks on leaves (especially on leaf-nerves, leaf-cushion), petioles, stems and pods. Technical description of the causal fungus which belongs to the genus Septogloeum SACC. emend. PETRAK (Tuberculariaceae) is given.
Accumulation of radioactive phosphorus-32 or sulphur-35 in the lesions produced by various treatments of the leaves of some Nicotiana plants water-cultured with the isotopes was tested. Zonate accumulation of phosphorus-32 was found at the tobacco leaf spots produced by 2per cent CuSO4 and by saturated KClO3 solutions; especially at the lesions produced by the latter the accumulation of phosphorus-32 was more conspicuous than by the former. No accumulation of the isotopes was found in the case of 0.5per cent HCl. Accumulation of phosphorus-32 or sulphur-35 was not observed at the punched portions by cork borer of tobacco leaves even after 6 days from treatment at room temperature. Accumulation of phosphorus-32 or sulphur-35 was found at the necrotic spots of N. glutinosa inoculated with TMV 48 hours before sampling.