Table 3. Forage yield and insect counts for alfalfa varieties differing in potato leafhopper resistance. The trial was seeded April 13, 1998 at South Charleston, OH.

	Forage yield*			Potato leafhopper counts on various dates in untreated plots
Variety	Untrt		Trt	6/8	6/17	6/24	7/1	7/8	7/24	7/31	8/6	8/12	8/19	8/25
	tons dm/acre			------------------------------ PLH adults per 10 sweeps ------------------------------
3A14B	3.04		3.38	2	118	56	15	64	28	11	17	16	24	37
54H69	2.87		3.37	1	137	76	21	107	35	20	27	13	28	42
Cleansweep	2.81		3.43	2	122	84	30	138	34	20	21	15	29	31
WL324	2.56		3.51	2	159	124	50	163	44	36	52	38	44	54
LSD (0.05)		0.44
				------------------------------ PLH adults per 10 sweeps ------------------------------
3A14B				0	0	17	15	37	2	4	3	12	7	9
54H69				0	1	38	27	104	2	4	12	20	16	7
Cleansweep				0	2	50	40	128	3	7	24	22	28	9
WL324				0	1	103	196	179	2	14	113	26	52	16

*Harvested on July 9 and Aug. 25, 1998. Untrt = no insecticide applied; Trt = insecticide applied three times in 1998. LSD is to compare forage yield for any two varieties within a treatment. To compare treatments within a variety the LSD (0.05) = 0.54.

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