TABLE CONTENTS

Agri-Terra: A New Low-rate Nematicide
McGawley, E.C.
Department of Plant Pathology & Crop Physiology, Louisiana State University AgCenter, Baton Rouge, LA
70808, USA
2007 was the seventh consecutive year of trials evaluating the efficacy of Agri-Terra against
nematode species associated with major crops in Louisiana. Trials with soybean, cotton, rice
and carrot were conducted in microplots. Concentrations of 0.5 and 1% and rates of 0, 5, 10,
20, 40 and 80 gallons per acre were applied to microplot soil infested with one or a
combination of five nematodes. The 10GPA/1% concentration was the most optimal
treatment for soybean, resulting in harvest plant weights, pod numbers and pod weights that
were significantly greater than those of controls. This concentration/rate combination of
Agri-Terra was also the best treatment for cotton, producing statistically significant increases
in plant growth and boll production while providing nematode control. The 0.5%
concentration of Agri-Terra produced slight to moderate increases in the overall growth of
rice and the 1% concentration produced moderate growth inhibition. All Agri-Terra
treatments of soil in microplots of rice resulted in marginal control of ring, spiral and stubbyroot
nematodes. Agri-Terra treatments also resulted in significant reductions in populations
of root-knot nematode on carrot. Residual nematode populations, however, caused marked
root galling and plant damage at harvest.
Commercial vegetable production protocols were employed in field trials with tomato,
cucumber and bell pepper. With tomato, Agri-Terra successfully managed reniform
nematode populations and resulted in significant increases in yields of tomato fruit in the
Extra-Large and Large size categories. With cucumber, treatment of soil with Agri-Terra
reduced reniform nematode populations significantly and increased yields of fruit in the
Super-Select and Select size categories. Results of field trials with cotton conducted in 5
consecutive years showed that the application of Agri-Terra to soil as an at-planting, infurrow
(fine mist) spray treatment produced highly significant decreases in nematode
populations and highly significant increases in yield.
MCW-2: A ‘True’ Nematicide Belonging to the Fluoroalkenyle Group
Oka, Y. (1), M. Berson (2) & A. Barazani (2)
(1) Nematology Unit, Gilat Research Center, Agricultural Research Organization, M. P. Negev 85288, Israel;
(2) Innovative Development Dept., Makhteshim Agan Group, Golan Street, Airport City, Israel
Nematicidal efficacy of MCW-2 (Makhteshim Chemical Works, Beer-Sheva, Israel), which
belongs to the fluoroalkenyle group, was studied in laboratory, growth chamber and in fields.
MCW-2 showed an irreversible nematicidal activity after exposure of Meloidogyne javanica
second-stage juveniles to 0.5 μg/ml solution for 48 hr and rinse in water for another 24 hr, in
contrast with fenamiphos or cadusafos, which had only reversible nematostatic effect at the
same or higher concentrations (~ 8 μg/ml). An EC formulation of MCW-2 inhibited the
nematode hatching at a high concentration (8 μg/ml), but the hatching recovered after rinse in
water. In pot experiments, the compound at a concentration as low as 0.25 mg/l soil showed
the same or better control efficacy against M. javanica than those of fenamiphos or cadusafos
at the same concentration. The duration of the nematicidal activity of the EC formulation
lasted at least two weeks after application into an alkaline sandy soil; however, fenamiphos
5 th International Congress of Nematology, 2008 313