Effect of photoperiod on population parameters of two color morphs of the pea aphid Acyrthosiphon pisum Study on predation preference of Harmonia axyridis (Pallas) and Adonia variegata (Goeze) on red and green color morph pea aphids Genetic Diversities of Acyrthosiphon pisum(Harris)(Pink form) Populations from Different Geographic Regions in the Northwest of China Effect of UV-B for Different Radiation Durations on Biological Characteristics of Two Color Morphs of Pea Aphid Acyrthosiphon pisum (Harris) Offspring Biochemical Resistance Mechanism of Medicago sativa to Acyrthosiphon pisum The effect of different alfalfa varieties on the midgut protease activity of pea aphid (Acyrthosiphon pisum) Parasitism and offspring fitness of Aphidius ervi Haliday in relation to its host Acyrthosphon pisum Harris at different stages Effects of continuous UV-B stress on biological characteristics of green pea aphid Effect of photoperiod on growth and development of two color morphs of pea aphid (Acyrthosiphon pisum) Effects of different garden pea cultivars on population parameters of green morph of pea aphid (Acyrthosiphon pisum) Effects of UV-B radiation on biological characteristics of differentcolor pea aphid morphs (Acyrthosiphon pisum) Effects of sublethal dosage of imidacloprid, abamectin and beta-cypermethrin on the development and reproduction of green of the morph of pea aphid (Acyrthosiphon pisum) Antibiosis of five alfalfa cultivars to two colour morphs of Acyrthosiphon pisum Genetic diversity of Acyrthosiphon pisum (green form) from differentgeographical populations Effects of Sublethal Dosage of Imidacloprid on the Growth, Development and Population Parameter of Two Color Morphs of Pea Aphid Field Evaluation of Resistance of Different Alfalfa Varieties to Acyrthosiphon pisum Harris Effects of Herbivore Stress by Acyrthosiphon pisum on the Contents of Tannin and Physiological Activity in Different Alfalfa Cultivars An evaluation of the main cultivated Medicago sativa cultivars (strains) for Acyrthosiphon pisum resistance in Ningxia Prey Responses of Propylaea japonica in Different Instars to Acyrthosiphon pisum under Growth Chamber Condition Detoxification enzymes activities in two color morphs of pea aphid (Acyrthosiphon pisum) treated with different sub-lethal concentrations of avermectin Population parameters of two pea aphid (Acyrthosiphon pisum) color morphs at different temperatures