The objective was to evaluate the effect of dose of vegetable extracts in the control of C. longissima in Laboratory and hothouse of the UNSM - T. For the test in Laboratory it gathered samples of leaves of Lactuca saliva L affected with the illness. The extracts got ready weighing 100 g of each plant. The leaves were crushed in a mortar and a pylon, the seeds were milled adding distilled water and macerating for 24 h. For this test the Design was used Totally at random (DCA} with factorial arrangement 10 (you plant} x 4 (dose: O mi, 1 mi, 2 mi and 4 mi) and the duncan test (at the 0,05). In this test the extracts of Ch. ambrosoides (1ml), A indica (1 mi, 2 mi and 4 mi), R. communis (1 mi) and S. torvum (4 mi and 2 mi), they obtained positiva effect on C. longissina with averages of size of colony of 1,582; 1,579; 1 ,54; 1,384; 1 ,537; 1 ,384 and 1 ,38 cm respectively, being statisticall...