Two trials, (1) factorial combinations of perennial peanut in row middles with nematicide in irrigated zone and (2) efficacy against sting nematode of oxamyl, aldicarb, fluensulfone, fluopyram, fluazaindolizine, and an experimental compound, were treated with recommended rates of each nematicide. All nematicides except aldicarb and oxamyl were applied in dedicated irrigation lines by irrigating (microjet) for 30 minutes, injecting the nematicide for 60 minutes, followed by 30 additional minutes of irrigation. Prior to treatments, dye was injected sequentially into the manifold controlling each treatment to ensure the plumbing was treating all of the experimental trees. On May 30 and 31, two months after treatments were initiated, soil samples were taken from all trials and processed (sucrose centrifugation) for nematode determination. Two nematicides reduced sting nematode populations by more than 70%, with no significant effect yet by four compounds. Because there is evidence that some of the new compounds move in the soil very litte after application, the injection period will be extended to 2 hours in an effort to increase efficacy. Effects on fibrous root density are being processed. Treatments of most products will be resumed in the autumn. Perennial peanut is establishing reasonably well in all plots since the onset of the rainy season. The large effort of watering and weed management required of the sod laid during the spring dry season argues for starting such plots during the summer. Similarly, the sunn hemp crop did not establish well during the dry season and is will be replanted in early July. A second nematicide trial was initiated at a second young orchard by treating with aldicarb on 26 April, with all remaining treatments to be initiated in autumn after the plots are plumbed.