The plant produces … rhubarb leaves as a pesticide? Rhubarb Spray - Organic Pesticide: Rhubarb is one of my favorite edible plants because of its delicious flavor in all sorts of foods. Does anybody know why the EU have banned the use of making a paste from rhubarb leaves for use in organic gardening as a pesticide? I'd always wondered if there was something I could be d… Dual Magnum is primarily an annual grass herbicide. The Rhubarb Compendium website has instructions for boiling leaves in water and combining the strained water with soapy water to create an organic pesticide. Rhubarb leaves contain oxalic acid which can not only stop your heart but makes a great natural pesticide for leaf eating insects. The large leaves are arranged in a rosette and have fleshy petioles which are often red in color and can reach 1–1.5 m (3.3–4.9 ft) in length The leaves are large and palmate with an irregular undulating edge. 1 Answer. The leaves of the rhubarb plant are actually poisonous and is the main reason this type of pesticide is effective. If plant lice (aphids) or other insect pests attack your plants, the acid in the rhubarb leaves should work to suffocate and otherwise disturb them. Add to a bucket or bowl. Asked June 19, 2016, 4:40 AM EDT We moved into a beautiful house a month ago, across from the State Fair, and I was so excited that I wouldn't have to beg my friends for rhubarb anymore, because the back yard had a marvelous patch of rhubarb! Favourite answer. … A plastic spray bottle is all you need to store and use your rhubarb leaf pesticide spray. It will burn rhubarb leaves but does no permanent crop damage. Pests are eating our rhubarb leaves! Anonymous. 3. Just make sure you use it in the evening as the pesticide will also kill … 1 decade ago. Rhubarb leaves spray #2 [edit | edit source] Pick 10 rhubarb leaves. Glyphosate should not be applied after rhubarb leaves have emerged because of potential crop injury. Most rhubarb plants will survive slug and snail damage easily and as the leaves get older in the season the slugs and snails will leave them alone - they prefer younger leaves near the ground. Cover with a lid, plate or other covering. It may be because rhubarb leaves contain oxalic acid which happens to be quite poisonous. Discard the leaves. Pre-emergence herbicides labeled for rhubarb include Dual Magnum, Callisto, Lorox, Caparol and Sandea. Pour the boiled water into the bucket with the chopped leaves, to cover. Gramoxone also is a RUP. Answer Save. Rhubarb is a robust, clump forming plant. Although we don't recommend chemicals for slugs and snails on rhubarb, there are … Relevance. Strain out the leaves. Chop the leaves roughly. For those of you who do not know, you eat only the stalk of rhubarb and throw the leaves away. Boil sufficient water to cover the leaves. Leave to cool.