Instar-specific and total nymphal development duration (±SEM) of .4. gossypii at six constant temperatures in the laboratory, 2003 27 2.3. Problems in the designation of type of life cycle and the evolutionary significance of the life cycle … Aphids have piercing-sucking mouthparts and have two protrusions on their rear tips called cornicles. During these migratory flights, aphids may spread viral diseases from infected volunteer plants and weeds to healthy crops. Young aphids are called nymphs. 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. Aphis gossypii is one of the most biologically diverse and widely distributed aphid species. ... Cotton aphids (Aphis gossypii) often infect sugarcane, papaya and peanuts with viruses. This aphid is globally distributed, located in all but the coldest terrestrial habitats. Life Cycle. 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. Life cycle: 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. 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. Life history parameters (±SEM) of A. gossypii at … Winged forms migrate to other hosts in late spring. 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. Adults pass the winter on greens and other wild hosts. Common Name: Cotton aphid or melon aphid Scientific Name: Aphis gossypii Glover Order: Homoptera Description:Adult aphids are winged or wingless, soft bodied yellow to dark green aphids 1/16 inch or less in size.Winged forms have a black head and thorax and hold their wings roof-like … cotton plants to growth chambers for the cotton aphid life history study, 2003 26 2.2. Common names. Aphids have many generations a year. 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