Laboratory and field experiments were conducted to evaluate the efficacy of the post-emergence herbicides, fluazifop-P-butyl, glyphosate-isopropylammonium, paraquat, and glyphosate-trimesium (sulfosate) as influenced by organosilicone-based adjuvants, 'Dyne-Amic' and 'Kinetic'. Conventional adjuvants 'Agri-Dex' and 'Induce' were included in all experiments for comparison. The experimental plots were naturally infested with bahiagrass, camphorweed, common lambsquarters, Florida pusley, Jerusalem oak, hairy beggarticks, pigweed, and teaweed. Herbicides were applied alone or in combination with 'Dyne-Amic', 'Kinetic', 'Agri-dex', or 'Induce' using a tractor-mounted boom sprayer. 'Dyne-Amic' (2.5 ml liter-1) was as effective as 'Agri-Dex' (10 ml liter-1) in increasing the efficacy of herbicides on grass and broadleaf weeds studied. 'Kinetic' at 2.5 ml liter-1 was as effective as 'Induce' at 2.5 ml liter-1 in increasing the efficacy of herbicides on the weeds studied. Paraquat tank-mixtures with the pre-emergence herbicides bromacil and diuron were more effective when applied at a spray volume of 280 liter ha-1 than at 140 liter ha-1. Fluazifop-P-butyl and glyphosate-isopropylammonium were more effective at 186 than at 93 liter ha-1. Addition of 'Kinetic' or 'Induce' to the herbicide spray solution had no effect on pH, but fluazifop-P-butyl reduced pH to 5.1 or increased it to 7.7 when added to the 93 and 186 liter ha-1 preparations, respectively. Glyphosate-isopropylammonium reduced pH to 5.0 at the lower, but had little effect on pH at the higher rate. Reduction in static surface tension and contact angle was greater with organosilicone-based adjuvants than with conventional adjuvants.

Experiment was designed to develop an insecticide application appropriate for the farmer practice. The trial was conducted in a farmer' field at Ban Kud Loam, Amphur Cholnabot, Khon Kaen. Plot size was 5*3 m with spacing of 50*20 cm. The crop was planted on 6 January 1992 and harvested on 22 April 1992. Five treatments were allocated in a randomized complete block design with 4 replications. It was observed that thrips occurred in a large number at the early stage of crop growth, while leafhoppers and leaf miners were present in a low number. Pod damages were also low. It may be concluded that pod yield decreased due to thrip infestation and control measure should be applied earlier than at 45 DAP. Since heavy infestation of thrips was noted at 30 days, therefore the insecticide should be sprayed at that date.

Usage of Ivermectin for eradication of Gastro-intestial nematode in 2-4 years old cattle were infected naturally. Three doses of Ivermectin were used for this experiment, 0.05, 0.1 and 0.2 mg/kg by single subcutaneous injection. It was found that a dose of 0.05 mg/kg gave high effect (96.7 %) for eradication. Any gastrointestinal nematode eggs were not found for 6 weeks after injection. Dose of 0.1 and 0.2 mg/kg gave higher effect for eradication (100 %) and gastro-intestinal nematode eggs were not found till 8 weeks after injection. Dose of 0.1 and 0.2 mg/kg could reduce numbers of gastro-intestinal nematode eggs to 0 within 1-2 days. The three doses used in this experiment could reduce gastro-intestinal nematode eggs very effectively