Knowledgebase

Citric acid #299167

Asked February 01, 2016, 2:21 PM EST

Can citric acid be used as a foiliar spray to control mites on tomatoes if so what concentration should the spray have. I would also use a surfactant such as dawn unsented soap. Thanks for your advice, John

Douglas County Oregon

Expert Response

John,  citric acid can be used for the control of many insects. Limonene  which is made from an extract from orange and other citrus peels is used in several commercial products.  It is available commercially as;  Ortho Home Defense Indoor Insect Killer, Concern Citrus Home Pest Control, and in products made by Orange Guard.  The citric acid is a contact killer and needs to be applied directly to the insect to be effective.  Since it is an acid it can be harmful to plant material.  For safety, we recommend the commercially prepared products mentioned above.  Always follow the direction on the label.  Many of the insects that invade our tomato crops can be controlled by removing all weeds in the vicinity of the plants.
An Ask Extension Expert Replied February 01, 2016, 5:20 PM EST

Loading ...