苜蓿品种(系)对苜蓿斑蚜存活率和生殖力的影响

在田间抗蚜性鉴定的基础上，在室内25℃条件下，选用4个抗蚜性不同的苜蓿品种(系)，测定了不同苜蓿品种(系)上苜蓿斑蚜Therioaphis maculate (Buckton)若虫存活率及生殖力的影响。结果表明: 苜蓿斑蚜在不同苜蓿品种（系）3、6叶期及成株期的存活率均以HA-3上最低，分别为8.00％±1.15％，21.27％±7.40％，17.07％±3.03％；Hu上最高，分别为25.63％±3.68％，42.27％±2.76％，55.10％±0.19％；且苗期显著低于成株期。以若虫存活率和内禀增长率作为测定抗生性的指标，供试品种(系)对苜蓿斑蚜抗生性的大小依次为HA-3>G3>JH>Hu，与田间抗性鉴定结果基本相近。

Effects of alfalfa varieties on the survival rate and fecundity of Therioaphismaculata (Buckton) ( Hemiptera: Aphidae)

Effects of four alfalfa varieties on survival rate and fecundity of Therioaphis maculata (Buckton) were investigated at 25℃ in the laboratory. The results showed that the survival rates of the aphid in the 3-leaf，6-leaf and adult stages were the lowest in HA-3 (8.00％±1.15％, 21.27％±7.40％, and 17.07％±3.03％, respectively), and the highest in Hu (25.63％±3.68％, 42.27％±2.76％, and 55.10％±0.19％, respectively). The survival rate was lower in seedling stage than in adult stage. The level of alfalfa resistance was in order of HA-3>G3>JH>Hu using the innate capacity of increase (rm) and the nymph survival rate as the indices of alfalfa antibiosis to the aphid，and this is correspondent well with that in fields.