Young aphids are called nymphs. Life history parameters (±SEM) of A. gossypii at … Problems in the designation of type of life cycle and the evolutionary significance of the life cycle … Adults pass the winter on greens and other wild hosts. Life cycle: Cotton or melon aphids, Aphis gossypii , are highly variable in size and color, varying from light yellow to dark green or almost black. In the north, female nymphs hatch from eggs in the spring on ... Aphis gossypii Glover (Insecta: Hemiptera: Aphididae) 2 Adult The wingless (apterous) parthenogenetic females are 1 to 2 mm in length. Major aphids found in Nepal are Green peach aphid (Myzus persicae), Cabbage aphid (Brevicoryne brassicae), mustard aphid (Lipaphis erysimi), Cowpea aphid (Aphis craccivora), Bean aphid (Aphis fabae), Cotton aphid (Aphis gossypii), Banana aphid (Pentalona nigronervosa) etc which have high occurrence. Aphis gossypii is an important cosmopolitan pest on Malvaceae and Cucurbitaceae plants (Carletto et al., 2009; Ebert and Cartwright, 1997).Cotton aphids present a similar life-cycle as other aphids species ().During spring and summer, the parthenogenetic population expands rapidly, resulting in a high nutrient consumption of the host plant. Aphis gossypii is one of the most biologically diverse and widely distributed aphid species. cotton plants to growth chambers for the cotton aphid life history study, 2003 26 2.2. Although size can vary based on environmental conditions, adult aphids tend to be about 1/16th inch in length, are soft bodied and pear shaped. This aphid is globally distributed, located in all but the coldest terrestrial habitats. The body is quite variable in color: light Aphis spiraecola and Aphis gossypii are the most abundant and diverse species in the region. In Georgia, the aphids are nearly all females. Aphids have many generations a year. Most aphids in California's mild climate reproduce asexually throughout most or all of the year with adult females giving birth to live offspring—often as many as 12 per day—without mating. During these migratory flights, aphids may spread viral diseases from infected volunteer plants and weeds to healthy crops. Aphids have piercing-sucking mouthparts and have two protrusions on their rear tips called cornicles. Instar-specific and total nymphal development duration (±SEM) of .4. gossypii at six constant temperatures in the laboratory, 2003 27 2.3. Life Cycle and Description The life cycle differs greatly between north and south. ... Cotton aphids (Aphis gossypii) often infect sugarcane, papaya and peanuts with viruses. Common names. Cotton aphid, Melon aphid.. Distribution. 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