Abstract: A plant disease control method and a plant disease control apparatus that can irradiate a plant under cultivation with an appropriate amount of near-infrared light to obtain an effect of controlling diseases while efficiently using light energy. The plant under cultivation is irradiated with the near-infrared light including a wavelength set within a wavelength range of 800 to 1000 nm so as to satisfy all following Equations 1 to 3 where X is an irradiance (W/m2) and Y is an irradiation time (second), so that the effect of controlling diseases can be obtained. 644893X?1.873?Y?5901.9X?1.856??Equation 1: X?1??Equation 2: Y?0.

Abstract: A plant disease control agent comprising at least one member selected from the group consisting of saccharides and substances each having a bactericidal and/or fungicidal activity. The plant disease control agents are effective for the control of cucumber, grape and cabbage downy mildew, damping-off in seedlings caused by Pythium spp, cucumber and barley powdery mildew, wheat stem rust, potato and tomato late blight, and others.

Abstract: A plant disease control agent comprising D-tagatose as an active ingredient; and a plant disease control agent comprising at least one member selected from the group consisting of saccharides and substances each having a bactericidal and/or fungicidal activity. The plant disease control agents are effective for the control of cucumber, grape and cabbage downy mildew, damping-off in seedlings caused by Pythium spp, cucumber and barley powdery mildew, wheat stem rust, potato and tomato late blight, and others.

Abstract: A disease control device has light emitting diodes (D1 to Dn) emitting green light and a controller (2) controlling a drive circuit (1) for turning on the light emitting diodes (D1 to Dn). The drive circuit (1) is controlled by the controller (2) to cause the light emitting diodes (D1 to Dn) to emit green light to irradiate plants with the light. The irradiation with the green light enhances resistance of the plants against diseases.

Abstract: A feeding method and apparatus for breeding natural enemy insects necessary for establishing a farming system that uses less or no pesticides and a rearing method for breeding natural enemy insects are provided. A feeding apparatus including a food supplying section, a feeding section, and a food introducing section via which the food supplying section and the feeding section are in communication with each other, and an attracting section made of a material having a specific color tone is designed, and is used to breed natural enemy insects.