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Giant Knotweed(Reynoutria sachalinensis)

Extract of Reynoutria sachalinensis (giant knotweed) is prepared by mixing the dried and ground plant material with ethanol. The ethanol extract consists of a mixture of many substances, including the substance(s) that induces resistance to certain fungi. Giant knotweed is a member of the buckweed family of plants. During the 19th century, it was introduced into Europe and North America from its native East Asia for use as cattle fodder.

When sprayed on plants, extract of Reynoutria sachalinensis (giant knotweed) causes the plants to activate an internal defense system that prevents growth of certain fungi, especially powdery mildew and gray mold. The extract is approved for use on ornamental plants grown in greenhouses. No adverse effects to humans or the environment are expected from use of the extract. Furthermore, products containing this active ingredient may help reduce human and environmental risks by decreasing the use of more toxic fungicides.

REGALIA® Rx Biofungicide is an extract from the plant Reynoutria spp. for use on edible crops. REGALIA® Rx applied to actively growing plants (see DIRECTIONS FOR USE) will improve plant health, and will help make the treated portions resistant to certain plant diseases. Plant health benefits often result in greater yields at harvest. Use REGALIA® Rx as a preventative rather than a curative application. Apply prior to disease infestation to protect the growing leaf tissue. See specific information for diseases controlled and use rates on edible crops.

Target Pathogens: Powdery Mildew, Bacterial Blight and Streak, Brown Rot, Leaf Spots, Rust, Septoria Leaf Spot, Fusarium, Phytophthora, Pythium, Rhizoctonia, Verticillium and Stem Rot.

Mode of Action: The extract obtained from Reynoutria spp. plant material contains active chemical compounds. The extract, when applied to the host plant, increases the plant’s defense system due to a five-fold increase in phenolics and antioxidants, and strengthens cell walls. This induced resistance against important diseases is not systemic, but provides some translaminar protection. Repeat foliar applications at 7–14-day intervals to maintain induction and to protect new plant growth. The resistance induction takes place within one to two days.

Application Tips: Many conventional fungicides have been tested in an IPM regime with REGALIA® Rx with very satisfactory results. One of the major objectives of IPM has been to reduce the probability of disease resistance development to a particular active ingredient.

The alternate use of (1–2 sprays) followed by a conventional, registered fungicide (1–2 sprays) has been successfully used in many crops. In addition, the use of tank mixes with a conventional fungicide has also been successful.