甘藷簇葉病之研究(III)嫁接接合時間與嫁接傳染

Abstract

本試驗自1968年10月至1970年4月間在嘉義農業試驗分所，從事甘藷簇葉病嫁接傳染試驗，比較各季節之嫁接合時間與嫁接傳染之關係，試驗結果，顯示木病需經嫁接接合8至10天以上始得嫁接傳染。春季（3月間）行穗接時，接合7天以下者，其傳染率為0，8天者為20%，31天者為100%。夏季（7月間）8天以下者為0，9天者20%，33天者為100%。秋季（10月間）9天以下者0，10天者為10%，32天者為80%。而靠接法嫁接傳染結果（5月至7月問），接合7天以下者其傳染率為0，8天者為20%，30天者為100%。春季之嫁接傳染速度較快，夏季次之，秋季又次之。而靠接法與德接法所得結果相似，沖繩1號與新竹1號兩所不同品種之砧木似無差異。 This paper reports the relationship of inoculum-receptor contact period to the rate of graft transmissiom of sweet potato witches' broom disease. In experiments in which infected inoculum (Chin-kna-chie variety) was removed daily from healthy receptor (Okinawa 100, and Hsinchu 1. variety), the following transmission rates observed: (1) 0 with an noculurn-receptor contact period of 7 day, 20% of 8 day and 100% of 31 day in the spring time. (2) 0 of 8 day, 20% of 9 day and 100% of 33 day in the summer. (3) 0 of 9 day, 10% of 10 day and 80%of 32 day in the autumn. (4) 0 of 7 day, 20% of 8 day and 100% of 30 day during spring to summer time. The sweet potato varieties involved in the inoculum-receptor combinations did not measurably influence the rate of graft transmission. These results are comparable to those deseribed by Bennett (1943), Kunkel (1938) and Fridlund (1967).