Aphid banker plants are used to manage green peach and melon aphids. Banker plants are used to rear, release and sustain aphid parasites before aphids appear in the crop. Barley plants or wheat plants are ordered from suppliers with bird cherry oat aphids on the plants. Cherry bird oat aphids attack only monocotyledons and should not be used in greenhouses with crops such as Easter lilies, Alstroemeria, ornamental grasses, orchids, day lilies, irises, spring bulbs (tulips, daffodils), palms, onions and garlic.
It is important to plan ahead if you will be using biological controls for pest management on your spring crops. Growers that successfully use biological controls for spring crops start in propagation greenhouses at the very beginning of the crop cycle. Biological control should never be started in the middle of a crop cycle. When purchasing plant material or liners, request information on what specific pesticides were applied to the plants to ensure that no long lasting pesticide residues adversely impact the biological control agents you plan to release.
Growers who purchased unrooted cuttings this season received a pest alert indicating Ralstonia solanacearum had been found on cuttings originating from Guatemala. USDA test results confirmed this. It is important to note that there are different strains of Ralstonia solanacearum.
An injector setting of 1:100 means that 1 gallon of fertilizer concentrate makes 100 gallons of final solution and does not mean that the injector is delivering 100 parts per million (ppm) nitrogen. Many injectors have a dual settings, in percent and ratio. A 1 percent setting is the same as a 1:100 ratio, a 2 percent setting is the same as a 1:50 ratio and a 0.5 percent setting is the same as a 1:200 ratio. To make the appropriate concentrate for a specific injector setting, determine the amount of fertilizer to dissolve per gallon of water.