Trunk injection or endotherapy also known as vegetative endotherapy,[1][2][3] is a method of target-precise application of pesticides,[4][5][6] plant resistance activators,[7] or fertilizers[8] into the xylem vascular tissue of a tree with the purpose of protecting the tree from pests, or to inject nutrients to correct for nutrient deficiencies. This method largely relies on harnessing the tree's vascular system to translocate and distribute the active compounds into the wood, canopy and roots where protection or nutrition is needed.[9]
Trunk injection/endotherapy is currently the most popular method for control of damaging insects,[10] pathogens,[11][12] and nematodes[13][14][15] in landscape tree care.
Endotherapy is the concept when treatments using the appropriate material formulation are carried out from the inside out through xylem translocation in the trunk/stem of plants during the photosynthetic cycle. Trunk injection is an older term that only reflects how the technique is performed.[16]
^Aćimović, S. G.; VanWoerkom, A. H.; Reeb, P. D.; Vandervoort, C.; Garavaglia, T.; Cregg, B. M.; Wise, J. C. (2014). "Spatial and temporal distribution of trunk-injected imidacloprid in apple tree canopies". Pest Management Science. 70 (11): 1751–1760. doi:10.1002/ps.3747. PMID24481641.
^Düker, A.; Kubiak, R. (2011). "Stem injection of prohexadione carboxylic acid to protect blossoms of apple trees from fire blight infection (Erwinia amylovora)". Journal of Plant Diseases and Protection. 118 (5): 156–160. doi:10.1007/BF03356398. JSTOR43229291. S2CID87886407.
^Aćimović, S. G.; VanWoerkom, A. H.; Garavaglia, T.; Vandervoort, C.; Wise, J. C.; Sundin, G. W. (2013). "Control of (Venturia inaequalis) using trunk injection of biopesticides and fungicides in apple trees". Phytopathology. 103 (Suppl. 2): S21–S2169. doi:10.1094/PHYTO-103-6-S2.1. PMID23676108.
^Barney, D.; Walser, R.H.; Nelson, S.D.; Williams, C. F.; Jolley, Von D. (1985). "Control of iron chlorosis in apple trees with injections of ferrous sulfate and ferric citrate and with soil-applied iron-sul". Journal of Plant Nutrition. 7 (1–5): 313–317. doi:10.1080/01904168409363198.
^Takai, K.; Suzuki, T.; Kawazu, K. (2003). "Development and preventative effect against pine wilt disease of a novel liquid formulation of emamectin benzoate". Pest Management Science. 59 (3): 365–370. doi:10.1002/ps.651. PMID12639056.