Boil sufficient water to cover the leaves. Pre-emergence herbicides labeled for rhubarb include Dual Magnum, Callisto, Lorox, Caparol and Sandea. 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! 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. It may be because rhubarb leaves contain oxalic acid which happens to be quite poisonous. Rhubarb leaves contain oxalic acid which can not only stop your heart but makes a great natural pesticide for leaf eating insects. Glyphosate should not be applied after rhubarb leaves have emerged because of potential crop injury. Favourite answer. 3. 1 decade ago. Add to a bucket or bowl. Relevance. Anonymous. Gramoxone also is a RUP. Answer Save. I'd always wondered if there was something I could be d… A plastic spray bottle is all you need to store and use your rhubarb leaf pesticide spray. Rhubarb is a robust, clump forming plant. rhubarb leaves as a pesticide? Discard the leaves. The plant produces … Chop the leaves roughly. Strain out the leaves. Pour the boiled water into the bucket with the chopped leaves, to cover. 1 Answer. The Rhubarb Compendium website has instructions for boiling leaves in water and combining the strained water with soapy water to create an organic pesticide. 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? It will burn rhubarb leaves but does no permanent crop damage. For those of you who do not know, you eat only the stalk of rhubarb and throw the leaves away. Although we don't recommend chemicals for slugs and snails on rhubarb, there are … Rhubarb leaves spray #2 [edit | edit source] Pick 10 rhubarb leaves. Rhubarb Spray - Organic Pesticide: Rhubarb is one of my favorite edible plants because of its delicious flavor in all sorts of foods. Leave to cool. Pests are eating our rhubarb leaves! Cover with a lid, plate or other covering. 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. … Just make sure you use it in the evening as the pesticide will also kill … The leaves of the rhubarb plant are actually poisonous and is the main reason this type of pesticide is effective. Dual Magnum is primarily an annual grass herbicide. 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.