Table 2.

Disease range and percentages of ashy stem blight-resistant plants for four pyramided common bean (Phaseolus vulgaris L.) breeding lines, their parents/known sources of resistance, and susceptible checks evaluated against PRI21 Macrophomina phaseolina (Tassi) Goidanich isolate at 42 and 21 days after inoculation in the greenhouse and the field in Isabela and Lajas, Puerto Rico, in 2021.

Genotype	Greenhouse					Field
	Isabela (April)		Lajas (February)			Isabela (May)			Lajas (September)
	Disease range	Resistant plants (%)	Disease range	Resistant plants (%)	Mean (%)	Disease range		Resistant plants (%)	Disease range	Resistant plants (%)	Mean (%)
New breeding lines with partial resistance to ashy stem blight
UPR-Mp-22	2-9	43.8	3-6	62.5	53.2	3-9		33.3	2-9	30.0	31.7
UPR-Mp-34	2-9	68.8	3-9	56.3	62.6	3-9		10.0	2-9	63.3	36.7
UPR-Mp-42	2-9	43.8	3-9	37.5	40.7	3-9		30.0	3-9	16.7	23.4
UPR-Mp-48	2-9	43.8	3-9	56.3	50.1	3-9		16.7	2-9	20.0	18.4
Parental genotypes and breeding lines reported with resistance to ashy stem blight
A 195	2-9	56.3	2-9	37.5	46.9	2-9		26.7	3-9	10.0	18.4
BAT 477	3-9	6.3	4-9	0.0	3.2	3-9		6.7	4-9	0.0	3.4
NY6020-4	3-9	18.8	3-9	6.3	12.6	3-9		3.3	3-9	3.3	3.3
‘PC 50’	2-9	43.8	2-9	25.0	34.4	3-9		16.7	3-9	10.0	13.4
PRA154	2-9	68.8	3-7	37.5	53.2	3-9		23.3	2-9	40.0	31.7
PRA155	3-9	37.5	3-7	56.3	46.9	3-9		16.7	2-7	60.0	38.4
SEA 5	3-9	12.5	3-9	18.8	15.7	4-9		0.0	4-9	0.0	0.0
TARS-MST1	3-9	25.0	7-9	0.0	12.5	4-9		0.0	4-9	0.0	0.0
XAN 176	3-9	6.3	4-9	0.0	3.2	3-9		16.7	3-9	6.7	11.7
Susceptible checks
‘Bella’	3-9	18.8	4-9	0.0	9.4	4-9	0.0		6-9	0.0	0.0
‘Verano’	3-9	6.3	7-9	0.0	3.2	4-9	0.0		5-9	0.0	0.0
Mean	…	33.4	…	26.3	29.9	…	13.3		…	17.3	15.3