Ascochyta Control in Chickpea
R.A. Henson, K.R. McKay, E.D. Eriksmoen, A.H. Lamey, and B.G. Schatz


A

schochyta blight attacks the leaves, stems, and pods of chickpea, reducing both yield and quality. Humid weather during the past two growing seasons has favored the development of this disease, resulting in severe economic losses to North Dakota producers. Until genetically-resistant varieties are developed, alternative control measures are needed. The objective of this research was to evaluate promising chemical fungicides for ascochyta control at the NDSU Research Extension Centers in Carrington, Minot, and Hettinger.

 As evidenced by disease ratings on the untreated plots, disease pressure ranged from moderate to very high across the three locations (Table 1). Bravo, the only post-emergence product currently labeled, showed overall poor disease control. Dithane, Flint, and Walabi were intermediate in disease control, while Quadris and BAS 500 provided the best control among the products and rates tested.

 As disease symptoms were reduced, yield was increased. At the higher yield levels recorded in Minot and Hettinger, two applications of Quadris and BAS 500 tended to improve yield over a single application. Under very high disease pressure at Carrington, the second application of these products more than doubled yield.

This work will continue in 2000, concentrating on Bravo (currently labeled), Quadris (possible registration for 2000), and BAS 500 (possible registration for 2001). 1


NDSU Vice President,
Dean and Director for Agricultural Affairs
NDSU Extension Service ND Agricultural
Experiment Station
NDSU College of Agriculture NDSU College of Human Development and Education