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À㳪¹«³ÐÀûÀÙ¹ú ¹æÁ¦ ÀӺп¡ ´ëÇÑ ÇÇÇغм® Damage Analysis of Stands in Which the Black-tipped Sawfly was Chemically Controlled |
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±Û¾´ÀÌ : °ü¸®ÀÚ
³¯Â¥ : 08-05-01 09:46
Á¶È¸ : 10498
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À㳪¹«³ÐÀûÀÙ¹ú ¹æÁ¦ ÀӺп¡ ´ëÇÑ À㳪¹« ÇÇÇغм® Damage Analysis of Korean White Pine Stands in Which the Black-tipped Sawfly was Chemically Controlled <Çѱ¹ÀÓÇÐȸÁö 87(3):328-333 Jour. Kor. For. Soc. 87(3):328-333 1998> Correspondent Chul Su Kim (Korea For. Res. Inst., Cheongnyangni-Dong, Dongdaemun-Gu, Seoul 130-012, Korea)
º» ¿¬±¸´Â À㳪¹«³ÐÀûÀÙ¹ú(Acantholydo posticalis posticalis Matsumura) Ç×°ø¾àÁ¦¹æÁ¦¸¦ ½Ç½ÃÇÑ ÀӺп¡ ´ëÇÑ ¹æÁ¦ ÀüÈÄÀÇ ÇØÃæ¹Ðµµº¯µ¿°ú ÇØÃæ¹æÁ¦·Î ÀÎÇÑ ÇÇÇØÀÓºÐÀÇ È¸º¹°úÁ¤À» ºÐ¼®ÇÔÀ¸·Î½á º» ÇØÃæÀÇ °ü¸®Ã¼°è¿Í ¹æÁ¦Àü·«ÀÇ ±âÃÊÀڷḦ Á¦°øÇϱâ À§ÇÏ¿© °æ±âµµ °¡Æò±º ¼³¾Ç¸é ȸ°î¸® ¼ÒÀçÀÇ ±¹À¯¸²¿¡¼ ¼öÇàµÇ¾úÀ¸¸ç ¾ò¾îÁø °á°ú´Â ´ÙÀ½°ú °°´Ù.
1. Ç×°ø¾àÁ¦¹æÁ¦ ÀӺп¡¼ÀÇ À㳪¹«³ÐÀûÀÙ¹ú ÅäÁßÀ¯Ãæ¹Ðµµ´Â 1ȸ ¹æÁ¦½Ç½ÃÈÄ ¾à 7³âµ¿¾È ÇÇÇØÇã¿ë¼öÁØ(50%) ÀÌÇÏ·Î À¯ÁöµÇ¾ú´Ù. 2. À㳪¹«³ÐÀûÀÙ¹úÀÇ °¡ÇØ·Î ÀÎÇÑ ¿±¼Õ½ÇÀ² 70% ÀÌ»óÀÇ ÇÇÇظñÀº ¾àÁ¦¹æÁ¦½Ç½Ã ÈÄ¿¡µµ ¼ö°í»ýÀå°ú Á÷°æ»ýÀåÀÇ ÀúÇØ°¡ 2~3³â°£ Áö¼ÓµÇ¾ú´Ù. 3. À㳪¹«³ÐÀûÀÙ¹úÀÇ ÇÇÇظ¦ ¹Þ¾Ò´ø À㳪¹«ÀÇ Á÷°æ»ýÀåÀº ¼ö°£ÀÇ ÇϺκ¸´Ù´Â »óºÎ¿¡¼ ´õ ºü¸¥ ¼Óµµ·Î ȸº¹µÇ¾ú´Ù. 4. ¿±¼Õ½ÇÀ² 70% ÀÌ»óÀÇ ÇÇÇظñÀº ¾àÁ¦¹æÁ¦½Ç½Ã ÈÄ¿¡µµ 3~4³â°£ ÀÓ¸ñÀÇ ÀçÀû°¨¼Ò°¡ Áö¼ÓµÇ¾úÀ¸¸ç, ÀÌ ±â°£ÀÇ ÀçÀû¼Õ½ÇÀ²Àº 19.6~54.0%À̾ú´Ù. 5. À㳪¹«³ÐÀûÀÙ¹úÀÇ °æÁ¦Àû ÇÇÇØÇã¿ë¼öÁØÀÎ ¿±¼Õ½ÇÀ² 50% ÀÌÇÏ¿¡¼ ¾àÁ¦¹æÁ¦¸¦ ½Ç½ÃÇÑ ÀÓºÐÀº ¹Ì¹æÁ¦ »óÅ·Π¿±¼Õ½ÇÀ² 90% ÀÌ»óÀÇ ÇÇÇرؽÉÀӺп¡ ºñÇÏ¿© ha´ç ¾à 40§©ÀÇ ÀÓ¸ñÀçÀû °¨¼Ò¹æÁöÈ¿°ú°¡ ÀÖ¾ú´Ù.
To obtain basic information for establishing a pest control strategy for insect pest management system, changes in the population densities of the black-tipped sawfly(Acantholydo posticalis posticalis Matsumura) and damage patterns in tree growth were investigated in national forests in Hoigok-ri, Kapyung-gun, Kyungi-do, where the pest control measures were taken. The results obtained were as follows.
1. The larval density in the soil of the forests where the insecticides were applied have been kept below economic threshold for about 7 years. The density was the highest in the middle of slopes and similar to the level of the early stage of the insect outbreak. 2. After the pest control by insecticides, reduction in tree height and diameter growth lasted for 2~3 years in trees defoliated by over 70%. 3. The diameter growth of the trees damaged by black-tipped sawfly recovered faster in upper stem than in the lower. 4. Volume growth of the trees defoliated over 70% by the insect decreased for three to four years. The volume loss of trees defoliated by 70% and 90% was 19.6% and 54.0%, respectively. 5. Maintaining the rate of defoliation below 59%, which is the economic threshold, by chemical control measures had an effect of reducing the tree volume loss by 40§©/ha as compared with a stand defoliated by 90%.
Key words: insect pest management, economic threshhold, insect outbreak, pest control
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