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. Problems in the designation of type of life cycle and the evolutionary significance of the life cycle … Winged forms migrate to other hosts in late spring. Life cycle: The body is quite variable in color: light Aphids have many generations a year. 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 spiraecola and Aphis gossypii are the most abundant and diverse species in the region. LIFE CYCLE. Life Cycle and Description The life cycle differs greatly between north and south. 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. The life cycle of some species involves an alternation between two species of host plants, for example between an annual crop and a woody plant. Aphids have piercing-sucking mouthparts and have two protrusions on their rear tips called cornicles. Common names. Cotton aphid, Melon aphid.. Distribution. cotton plants to growth chambers for the cotton aphid life history study, 2003 26 2.2. Young aphids are called nymphs. In Georgia, the aphids are nearly all females. Cotton or melon aphids, Aphis gossypii , are highly variable in size and color, varying from light yellow to dark green or almost black. 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. Life Cycle. Instar-specific and total nymphal development duration (±SEM) of .4. gossypii at six constant temperatures in the laboratory, 2003 27 2.3. Adults pass the winter on greens and other wild hosts. 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. During these migratory flights, aphids may spread viral diseases from infected volunteer plants and weeds to healthy crops. Aphis gossypii is one of the most biologically diverse and widely distributed aphid species. This aphid is globally distributed, located in all but the coldest terrestrial habitats. ... Cotton aphids (Aphis gossypii) often infect sugarcane, papaya and peanuts with viruses. 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