잎브로콜리에 심각한 피해를 주는 배추좀나방의 적절한 방제시기 설정을 위한 기초자료로 이용하기 위하여 유충접종밀도와 잎브로콜리 피 해량의 관계를 분석하여 경제적피해허용수준과 요방제 수준을 설정한 결과는 다음과 같다. 배추좀나방 3~4령 유충을 주당 0, 0.5, 1.0, 1.5, 2.0 마리를 5월 24일에 접종하고, 6월 1일, 6월 9일, 6월 18일에 발생밀도와 엽수량을 조사한 결과, 초기 접종밀도가 증가할수록 배추좀나방의 발생 밀도는 증가하였고 시간이 경과할수록 엽수량은 감소하였다. 이를 토대로 배추좀나방의 접종밀도와 수량감소율을 회귀식을 이용하여 분석한 결 과 y=1636-394x (R 2 =0.79***)로 추정되었다. 잎브로콜리에서 5% 피해율을 경제적 피해한도로 볼 때 배추좀나방의 경제적피해허용수준은 10 주당 2~3마리이고, 요방제 수준은 10주당 1-2마리 수준으로 추정된다.

To control pest of Brassicaceae leafy vegetable(leaf broccoli, Red Mustard Leaf, Tatsoi) which grows at vinyl house in IKSAN, Jeollabuk-do, the non-treatment was set as negative control, and treatment was divided into Parasitic natural treatment group and general treatment group. And incidence density of pest was surveyed and control effect was analyzed. As a result, in case of spring plants, the leaf damage ratio was decreased by 31% in Leaf broccoli, 30% in Red mustard leaf and 27% in Tatsoi compared to untreatment. In case of autumn plants, it was decreased by 32%, 41% and 17% respectively. The key pests were Plutella xylostella, Pieris rapae, Myus persicae Sulzer, Thrips palmi and Striped cabbage flea-beetle. Compared with the untreatment, the incidence density of each was significantly controlled. Other pests include Spodoptera exigua, Macdunnoughia purissima, Macdunnoughia purissima which showed high incidental density sometimes. In case of spring plants, the number by treatment was increased by 117% in Leaf broccoli, 85% in Red mustard leaf and 1,000% in Tatsoi. In autumn plants, it was increased by 132%, 257% and 1,077% respectively. The used Parasitic natural and eco-friendly materials were Cotesia glomerata, lacewing, ladyburg, Orius laevigatus, Encarsia formosa, Entomopathogenic nematode, Chungjigi and Togkaki. During early development of each pest, the Parasitic naturals were grazed 2~3 times at the interval of 7~10days. During the peak time, eco-friendly materials were sprayed 1~2 times. Based on this, comprehensive management model was drafted by period for each Brassicaceae vegetables pest.

This study was conducted to develop the economic threshold for the diamondback moth (Plutella xylostella (L.) on Leaf Broccoli (leaf vegetable) in 2007. To investigate the relationship between initial density of diamondback moth larvae and broccoli leaf yield, experimental plots with five treatments (0, 0.5, 1.0, 2.0, 4.0 larvae per plant) as initial density were established. We inoculated larvae in chesses cloth covering to survey larvae density change. When grown to eat, leaves of broccoli were harvested by periods. 60-70% of larvae were removed whenever we picked the leaves. High levels of larvae were associated with significant reductions in leaf yield. There were 85%, 64%, 58%, and 56% yield reductions from the diamond back moth larvae density in 0, 0.5, 1,0, 1.5, 2.0 per plant, respectively 25days after larvae inoculation. The regression equation used to predict leaf yield based on the number of initial larvae density per a plant was y=1635-393x(R2=0.79***). The economic injury level of diamondback moth on leaf broccoli was 2-3 larvae per 10 plants for a damage level of 5%. The economic thresholds was 1-2 larvae per 10 plants. Thus, the diamond back moth management should be initiated 1-2 larvae occurrence per plant.

브로콜리의 측지재배에 있어서, 엽령이 다른 시기의 생장점 제거가가 브로콜리의 생육 및 수량에 미치는 영향을 검토하였다. 적심은 육모기중 본엽 2매, 3매, 4매시에 실시하였으며, 무적심을 관행재배로 하였다. 초장은 처리간 생육차이를 보이지 않았으나 생체중은 적심시기가 늦어짐에 따라 감소되는 경향을 보였다. 적심처리의 경우 무적심에 비하여 엽수 및 측지수가 증가하였다. 정화리 형성일은 2매 적심처리에서 무적심에 비하여 3일 정도 빠라졌다. 정화뢰(첫번째 화뢰) 무게는 무적심에서 244g으로 가장 무거우T으며, 적심처리의 경우 무적심에 비하여 엽수 및 측지수가 증가하였다. 정화뢰 형성일은 2매 적심처리에서 무적심에 비하여 3일 정도 빠랄졌다. 정화뢰(첫번째 화뢰) 무게는 무적심에서 244g으로 가장 무거웠으며, 적심처리의 경우 적심시기가 늦어짐에 따라 감소되었다. 2번째 화뢰중은 본엽 2매 적심처리에서 157g으로 가장 무거웠다. 총 화뢰중은 본엽 2매시 적심처리에서 378g으로 가장 무거웠으며, 4매 적심시 196g으로 가장 가벼웠다. 상품수량은 무적심 1,184kg에 비하여 본엽 2매 적심시 1,754kg으로 48%의 증수효과를 보였으며, 본엽 4매 적심시 820kg으로 가장 적었다. 첫 수확일은 본엽 2매 적심처리에서 무적심에 비하여 6일 정도 조기수확이 가능하였다.