Apterous, parthenogenetic, viviparous aphids of Aphis gossypii were collected from taro and brinjal plants found in the wild at five differ-ent locations, separated by about 2000 m distance from each other, in and around Agar-tala, northeast India (23.50° N latitude, 91.25° E longitude). Host plant specialization of the pea aphids was found to be governed by a facultative symbiont, R. insecticola (Tsuchida, Koga & Fukatsu, 2004). DNA Barcoding Subtropical Aphids and Implications for Population Differentiation. Three replications were performed for each genotype and host plant. 5A). A suc-cess rate of zero for A. gossypii clones on unfamiliar plants of different genera suggested the inability of the respective laboratory clones to accept a new host environment. Robert Aphid size at birth and at final moult of taro clones were 1.30 times and 1.13 times bigger, respectively, in com-parison to aphids reared on brinjal host. Dr. Russell L Groves The authors declare there are no competing interests. In contrast, the cotton-specialized aphids preferentially chose the vigorous seedlings of cotton and fed on the new leaves (Xu, Ma & Liu, 2014; Liu, Xu & Lei, 2017). 4). O host plants may be an effective measure to suppress A. gossypii outbreaks, because cotton and cucumber are often grown together in fields and greenhouses. All aphids are soft-bodied and pear-shaped with a pair of cornicles, or little horns, projecting from the rear end of their abdomens. 1). Many crops are attacked including greenhouse transplants of pepper, tomato, and cabbage, along with beet, carrot, broccoli, Brussels sprouts, lettuce, eggplant, and potato. Host Plant Specialization in the Sugarcane Aphid Melanaphis sacchari. Repeat in at least 10 locations per field. Tiggers Aphids on the World’s Trees. At this point, plants were replaced by fresh ones in order to maintain the vigor of the aphid culture. G Influence of Temperature on Flight, Walking and Oviposition Capacities of two Aphid Parasitoid Species (Hymenoptera: Aphidiinae). In spring winged females fly to suitable host plants and produce live young nymphs through a process called parthenogenesis. Comparisons of the rm among different genotypes on artificial diet or excised leaves, and population sizes among aphid genotypes on cotton and cucumber were analyzed using ANOVA followed by Tukey HSD post hoc comparisons. Symbiont density in aphids was different when aphids fed on different host plants (Zhang et al., 2016). The life tables of three genotypes from cotton and three genotypes from cucumber were also performed on the excised cotton and cucumber leaves, respectively. Is ecological speciation a major trend in aphids? Fourth instar aphids produced of the same genotype of a grandmother on a plant species were used in experiments. 1978; Egbe and Rickard 1990; Estaben et al. 1-216 pp. Fifteen to twenty apterous adult aphids were transferred onto the Parafilm in the tube, and then the other end of the tube was covered with one layer of Parafilm to prevent escape of aphids (Fig. Reproductive time, however, was significantly longer in aphids of brinjal clones (1.75 times) in comparison to that from the taro clones (t = 5.59, df = 18, p = 0.01). In the field, asex-ual, wingless, and viviparous, morphs (apterae) of A. gossypii showed sharp differ-ences in body color and colonization behavior on the two host plants, which possibly pro-vided different food environments to the aphids. Using random amplified polymorphic DNA markers, Vanlerberghe-Masutti and Chavigny (1998) showed that populations of Aphis gossypii collected on plants of the same family were multi-clonal. In this study, we found that the artificial diet lacking in secondary metabolites could alter the host range of a part of genotypes in A. gossypii aphids from cotton and cucumber. The time taken to reach the maximum popula-tion size (T) was calculated by the equation T = ∑no. Nymphs were al-lowed to become apterous adults, to reproduce in the first 24 hours, and then the adults were removed. The damage risk evaluation of Aphis gossypii on wheat by host shift and fitness comparison in wheat and cotton. Sandall Raworth. High quality figures are available online. Winged forms have a black head and thorax and hold their wings roof-like over the back of the body. . Host plants: Artichoke, asparagus, bean carrot, corn, lettuce, parsnip, rhubarb, spinach, squash, Appearance: Gray-green with a powdery, waxy covering, Host plants: Broccoli, Brusssels sprouts, cabbage, collards, kale, kohlrabi, radish. Lin Ma conceived and designed the experiments, performed the experiments, analyzed the data, contributed reagents/materials/analysis tools, prepared figures and/or tables, authored or reviewed drafts of the paper, approved the final draft. Angelo . Distribution. Its weight was recorded, and it was allowed to develop to the final molt, at which time it was weighed again and observed for the durations of pre-reproduction, reproduction, and post-reproduction. Intraguild Predation Responses in Two Aphidophagous Coccinellids Identify Differences among Juvenile Stages and Aphid Densities. Population growth rate (GR), denoting the increase in the number of aphids of a clone per day per plant in the rising phase of popula-tion increase, was calculated by the formula. Genetic trade-offs associated with host use have been found in phytophagous insects (Hawthorne & Via, 2001; Gompert & Messina, 2016). Given that there has been no re-ported occurrence of sexual reproduction in A. gossypii in India, the chief factor that might be contributing to the observed variability in A. gossypii populations from different plant spe-cies could be the host plant specialization. 2009). Feeding experience on artificial diet induced the expansion of host range of the cucurbit-specialized A. gossypii, and this expansion was genotype-specific. This specialization implies that no or little infestation will occur of A. gossypii populations from taro to brinjal and vice versa. 5A). These were allowed to grow, reproduce, and increase in number. Significant differences between the clones from two host species were also recorded in development time, generation time, fecundity, intrinsic rate of increase, net reproductive rate, and mean relative growth rate. What do spring migrants reveal about sex and host selection in the melon aphid?. Individual plants, two from each location, were infected with a single, fourth instar, ap-terous aphid collected from their respective locations in the fields. Aphids, also known as plant lice are soft-bodied, sucking insects. The aphids from intact cotton and cucumber plants did not establish populations on the alternative host plant. Diversity and Evolution of Root-Knot Nematodes, Genus Cotton aphid or melon aphid, Aphis gossypii Glover (Homoptera: Aphididae). In some cases, it’s the appearance of virus symptoms that indicate aphid activity. is dependent on aphid genetic background and feeding experience JA Some of the more common species are listed below. In late summer, in response to the shortened daylight hours, wingless females and males are produced for the purpose of mating and laying fertilized eggs that will survive adverse winter conditions.

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