농가의 재배종자 유형 및 소독방법에 따른 키다리병의 발생 현황 

이순계^1＊최병준 변종영²

충남농업기술원¹, 충남대학교 식물자원학부²

Sun Gye Lee¹*, Byung Jun Choi, and Jong Yeong Pyon²

1^{Chungnam Agricultural Research & Extension Service and}2^{Chungnam National University}

실험목적

2000년 이후 친환경 재배면적의 증가로 약제방제 기피 및 소홀과 키다리병에 이병성품종의 재배면적 증가로 급격히 발생이 증가하여 농가의 민원이 발생되고 방제법에 대한 요구가 증대됨에 따라 농가의 키다리병 발생 및 소독방법을 조사하여 키다리병 방제를 위한 기초자료로 활용하고자 본 조사를 수행하였다. 

재료 및 방법

○ 본 실험은 2008년도 충남의 11개 시‧군 50농가(정부 보급종 분양농가 30, 자가채취 농가 20)를 대상으로 키다리병 방제를 위해 사용하는 약제 및 약제별 키다리병 방제효과를 구명하고자

조사하였다.

○ 조사는 못자리 기간에 1회, 본답기간에 1회 등 2회에 걸쳐 농가를 방문하여 실시하였으며 

종자소독, 최아 방법 및 육묘시기 및 본답에서의 키다리병 발생 등을 조사하였다.

○ 못자리에서의 키다리병의 발생비율은 묘판당 발생개체수를 평균으로 나누어 조사하였다.

실험결과

○ 농가의 벼 키다리병 방제를 위한 약제는 정부 보급종 분양농가에서는 prochloraz처리가 54%였으며, 자가 채취농가에서는 prochloraz+fludioxonil처리가 60%로 높았다.

○ 벼 키다리병 발생은 정부 보급종 분양농가에서는 33%, 자가채취 농가에서는 55% 발생되었으며, 생육시기별 조사에서는 정부 보급종 분양농가가 못자리에서 23% 발생된 반면, 자가채취 농가에서는 35% 발생되었다.

○ Prochloraz+fludioxonil 처리에서 벼 키다리병 발생은 못자리에서는 정부 보급종 분양농가와 자가채취 농가 모두 키다리병의 발생이 없었으나, 본답에서는 정부 보급종 분양농가에서 10%, 자가채취 농가에서 30% 발생되었으며, prochloraz 처리에서는 못자리에서 벼 키다리병이 발생된 포장에서는 본답에서 벼 키다리병이 100% 발생되었다.

○ 약제소독방법별 벼 키다리병 발생비율은 prochloraz+fludioxonil처리에서는 발생이 없거나 1% 미만이 96%인 반면, prochloraz처리에서는 70%이었다.

○ 품종별 벼 키다리병의 발생비율은 밀양 165호 계통인 주남벼와 호품벼에서 76%였고, 평안벼, 다미벼가 각각 9.5%, 일미벼가 5%이었다.

○ 종자소독을 위한 방법으로 최아기를 이용하는 농가는 54%, 정부 보급종 농가에서 43%, 자가 채취농가 70%이었으며, 종자소독 시간은 48시간이 84%로 높은 경향이었다.

○ 농가의 살충제별 소독약제는 fenitrothion 처리가 52%로 가장 사용이 많았고, fenthion 약제는 26% 사용이 되고 있었다.

󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏󰠏

연락처 : 이순계  E- mail : Isoong4@hanmail.net  전화 : 041- 732- 7008

Table 1. Farms surveyed on occurrence of bakanae disease by regions.

Total	Regions
	Cheonan	Gongju	Boryeong	Asan	Nonsan	Yeongi	Buyeo	Yesan	Seocheon	Cheongyang	Dangjin
50	3	3	2	3	16	4	2	4	3	2	4

Table 2. Occurrence of bakanae disease by seed disinfection methods among government seed supplying farms and farm own seed collecting farms.

Total	Government seed supplying farms				Farmer own seed collecting farms
	Subtotal	Prochloraz	Prochloraz+ Fludioxonil	Hot water	Subtotal	Prochloraz	Prochloraz+ Fludioxonil
50	30 (100%)	16 (54)	13 (43)	1 (3)	20 (100%)	8 (40)	12 (60)

Table 3. Occurrence of bakanae disease by rice growing stage.

Rice growing stage	Government seed supplying farms					Farmer own seed collecting farms
	Total	Subtotal	Prochloraz	Prochloraz+ Fludioxonil	Other	Other	Prochloraz	Prochloraz+ Fludioxonil	Other
Seedbed	14 (28%)	7 (23%)	7 (23)	0 (0)	0 (0)	7 (35%)	7 (35)	0 (0)	0 (0)
Paddy	21 (42%)	10 (33%)	7 (23)	3 (10)	0 (0)	11 (55%)	7 (35)	4 (20)	0 (0)

Table 4. Occurrence of bakanae disease by fungicides.

Degree(%) of  bakanae disease	Government seed supplying farms					Farmer own seed collecting farms
	Total	Subtotal	Prochloraz	Prochloraz+ Fludioxonil	Other	Subtoal	Prochloraz	Prochloraz+ Fludioxonil
0	28	20	8	11	1	8	0	8
0.1～1%	14	8	5	3	0	6	3	3
1～5%	6	2	2	0	0	4	3	1
5～10%	0	0	0	0	0	0	0	0
10～30	2	0	0	0	0	2	2	0

Table 5. Occurrence of bakanae disease by rice cultivar. 

Number of  cultivar	Total					Government seed supplying farms					Farmer own seed collecting farms
	Junam	Hopum	Pyangan	Dami	Ilmi	Subtotal	Junam	Hopum	Pyang an	Ilmi	Subtotal	Junam	Hopum	Dami	Pyang an
21 (100%)	9 (43)	7 (33)	2 (9.5)	2 (9.5)	1 (5)	10 (100%)	5 (50)	3 (30)	1 (10)	1 (10)	11 (100%)	4 (36)	4 (36)	2 (18)	1 (9)

Government seed supplying farms

Farmer own seed collecting farms

Total

Subtotal

Seed soaking

Convention

Hot water

Total

Subtotal

Seed soaking

Convention

24hr

48hr

10 min

24hr

48hr

24hr

48hr

10 min

24hr

48hr

24hr

48hr

24hr

48hr

30 (100%)

3 (10%)

26 (87%)

1 (3%)

0 (0)

13 (43)

3 (10)

13 (43)

1 (4)

20 (100%)

4 (20%)

16 (80%)

1 (5)

13 (65)

3 (15)

3 (15)

Table 7. Seed disinfection by inseticides government seed supplying farms and farm own seed collecting farms. 

Total	Government seed supplying farms						Farmer own seed collecting farms
	Subtotal	Fenitrothion	Ffenthion	Ddiazinon	Hot  water	Control	Subtotal	Ffenitrothion	Ffenthion	Control
50	30 (100%)	16 (54)	9 (30)	2 (7)	1 (3)	2 (7)	20 (100%)	10 (50)	4 (20)	6 (30)