• 作者： 陳秋男; 陳光火
• 作者服務機構： 臺灣植物保護中心
• 中文摘要： 1. 以2.5 ppm Manta 處理五齡的「國．富×農．豐」家蠶，顯示在春夏蠶於五齡的第48～72 小時處理效果最好；秋蠶期則於第48小時處理最適宜。 2. 處理組之五齡蠶齡期，在夏期及秋期者比對照組約延長3天，但晚晚秋者可延長達 6.5天。 3. 秋蠶處理者其乾繭產量及繭絲產量約增加 20%及24%；此值在晚晚秋蠶則為 62.5%及45%。 4. Manta 處理亦提高蠶繭及繭絲品質，其繭層率均在20%以上，落緒次數一般有減少趨勢，絲長則普遍增加，繭絲纖維度亦提高，但解舒率則不太穩定，有時大於有時小於對照組者。 5. 據保守的估計，有一甲桑園的農戶，一年可養30張壯蠶，施用 Manta 者比不施用者每年可增加收益達11,500元。所以施用Manta 確實可以增加蠶絲產量及提高其品質，此法不僅經濟而且易行，值得推廣。
• 英文摘要： Tests were conducted during the silkworm-rearing season of summer (June-July), fall (Aug.-Sept.) and late fall (Nov.-Dec.) of 1977. The5th instar larvae of the hybrid strain, Kuo-Fu xNung-Feng, were tested for their responses tothe insect growth regulator, Mantar , at 2.5 and4.0 ppm at the 48th, 72nd and 96th hr. duringthat stadium. The Manta solution was sprayeddirectly on the silkworms before feeding themwith mulberry leaves. Results showed that Manta could prolongthe 5th larval stadium by 3 days and 6.5 daysbeyond normal during the summer-fall seasonand late fall season respectively. Among thevarious treatments, the application of 2.5 ppmduring the 48th-72nd hr. in the summer, 48thhr. in the fall, and 96th hr. in the late fallseason gave the best results so far as improvingsilk yield and quality were concerned. Theyields of dry cocoons and cocoon silk respec-tively increased by 20% and 24% relative tothose of the untreated groups during the fallseason; while those for the late fall were 62.59%and 45% respectively. Furthermore, it was estimated that ifManta were applied in sericulture, then theadditional profit over the untreated ones wouldbe valued at NT$ 11,500 per hectare of mulberrygrove each year based on the rearing of 30sheets of silkworms (Ca. 450,000 silkworms) peryear which is a common practice in Taiwan.
• 中文關鍵字： --
• 英文關鍵字： --