Development and fecundity of the foxglove aphid, Aulacorthum solani (Hemiptera: Aphididae) were investigated at ten constant temperatures (photoperiod: 15L:9D) from 2.5 to 30℃ on soybean (Glycine max) leaves. The nymphs couldn’t emerge to adults at 2.5 and 30℃. The lower development temperature threshold and thermal constant of development completion estimated with a linear development model in nymph were 5.02℃ and 131.2 degree-days. The lethal temperatures were estimated as 33.9 and 32.5℃ with Lactin 2 and Logan 6 non-linear models, respectively. Mean generation time (from 78.4 to 11.8 d) decreased with increasing temperatures (from 7.5 to 27.5℃). The highest net reproductive rate (77.4) was observed at 20℃. The highest intrinsic rates of population increase (0.282) and shortest population doubling times (2.07 d) were recorded at 25℃.

We performed molecular and morphological analyses to determine generic limit of the genus Aulacorthum including several species with controversial taxonomic histories. The sequences of four mitochondrial genes, COI, COII, srRNA and lrRNA, and one nuclear gene, EF1a, implied that Aulacorthum is not monophyletic, with Aulacorthum magnoliae and Aulacorthum nipponicum forming a clade that is not sister to other currently recognized Aulacorthum species. Morphometric analysis based on 20 morphological characters also showed that A. magnoliae and A.nipponicum exhibited morphological characteristics distinct from congeneric species. Based these results, we propose a new genus, Neoaulacorthum ge. n. for A.magnoliae and A.nipponicum.

Fourteen species of the genus Aulacorthum Mordvilko 1914 (Sternorrhyncha: Aphididae) are recognized from the Korean Peninsula. One new species, Aulacorthum artemisiphaga sp. nov. on Artemisia princeps and Artemisia stolonifera (Asteraceae) was compared with the seven congeneric species based on their morphological and molecular characteristics. Morphometric analysis using 29 morphological characters shows that A.artemisiphaga sp. nov. can be distinguished from the seven congeneric species. In comparisons of COI and CytB genes, A. artemisiphaga sp. nov. had inter-specific genetic distances (average 7.5% for COI and average 7.4% for CytB) similar to those of other congeneric species. Host plants of the Korean Aulacorthum are reviewed.

The development of Aulacorthum solani (Kaltenbach) was studied at temperatures ranging from 12.5 to 27.5℃ under 65±5% RH, and a photoperiod of 16:8 (L:D). Mortality of 1st~2nd nymph was higher than that of 3rd~4th nymph at the most temperature ranges whereas at high temperature of 27.5℃, more 3~4th nymph stage individuals died. The total developmental time ranged from 16.9 days at 12.5℃ to 6.6days at 22.5℃, suggesting that higher the temperature, faster the development. However, at higher temperature of 25℃ the development took 7.4 days. The lower developmental threshold temperature and effective accumulative temperatures for the total immature stage were 0.08℃ and 162.8 day-degreeslated development. The nonlinear shape of temperature rewas well described by the modified Sharpe and DeMichele model. When the normalized cumulative frequency distributions of developmental times for each life stage were fitted to the three-parameter Weibull function, attendance of shortened developmental times was apparent with in 1~2nd nymph, 3~4th nymph, and total nymph stages in descending order. The coefficient of determination r² ranged between 0.86 and 0.91.

Adult longevity and fecundity of the foxglove aphid, Aulacorthum solani Kaltenbach, were studied at 12.5~25℃ with 60~70% RH under 16L:8D and the results were put together to build a life table. The longevity of foxglove gradually increased with decreasing temperature below 25℃. Also total fecundity increased with decreasing temperature and highest fecundity was 74.1 nymphs per female at 15℃. However, daily fecundity increased with increasing temperatures up to 20℃ showing 2.9 nymphs per day and thereafter decreased. Net reproduction rate (R₀) was highest of 58.7 at 15℃. The intrinsic rate of increase per day (r<SUB>m</SUB>) and the finite rate of increase per day (λ) were highest of 0.27 and 1.32, respectively and the doubling time (Dt) was shortest of 2.52. the mean generation time (T) was 10.99 at 22.5℃.

포장내에서 실수조사에 의한 진딧물 발생상황과 살충제(Carbofuran 립제, Disulfoton 립제, Ortra 분제)의 약량을 달리한 파구처리효과를 검토해 본 결과 아래와 같다. 1. 콩에서는 싸리수염진딧물과 콩진딧물이 우점종으로 전자는 작물생육 초기와 후기에, 후자는 7월 중순(중기)에 밀도가 높았으며 황색수반에 유살된 싸리수염진딧물은 초기 및 후기 유살수가 높았으나 콩진딧물은 후기에 낮았다. 2. 입묘율은 Carbofuran구에서 높았고 Disulfoton과 Ortran구는 낮았으며 약해는 Carbofuran구에서 심하였으나 기타는 경미하였다. 3. 바이러스 이병율은 로 낮았으며 약제 및 약량간에 차이가 없었다. 4. Carbofuran, Disulfoton은 처리후 65일까지 진딧물 방제효과가 인정된 반면 Ortran은 51일부터 효과가 떨어지는 경향이었다. 5. 수량은 약제 및 약량간에 차이는 있으나 일정한 경향이 없는 것은 생육말기의 도복이 큰 원인으로 생각된다.