The toxicity of methanol extract from 28 plants toward four agricultural insect pests were examined using contact toxicity bioassay with spray methods. At a concentration of 1,000 ppm Achyranthes japonica whole body was observed strong activity against Myzus persicae. Paeonia lactiflora root and Corydalis turtschaninovii rhizome methanol extract were observed strong activity toward Tetranychus urticae. Catalpa ovata leaf and Ginkgo biloba leaf and stem methanol extracts were revealed high activity toward Nilaparvata lugens. Actium lap root methanol extract was observed moderate activity against Plutella xylostella. High or moderate insecticidal activity of plant extracts were listed in Fig.1. These plant resource, particularly plant methanol extract or insecticidal constituents, merit further as potential insect pest control agents or leads because of their great activity as a insecticide.

A new cultivars Dendranthema grandiflourm ‘My Bear’ was developed at Gyeonggi-do Agricultural Research ＆ Extension Services(GARES),Korea in 2011. The cultivar ‘My Bear’ was crossed in 2007 between ‘Isabelle’, a pot-mum cultivar with yellow decorative type, and ‘Auburn red’, a pot-mum cultivar with red single type. Trials were conducted from 2008 to 2011 for evaluations and selection of this variety, including a shading culture in summer and a retarding culture in autumn. The natural flowering time of ‘My Bear’ was early November, and year-round flowering is possible by shading or lighting treatment. After the test of specific characters from 2009 to 2011, it was finally selected and named. The cultivar has an semi-decorative type flowers with white petals and a yellow center when full flowering. The diameter of flower is 36.0mm. Numbers of flowrs per stem and petals per flower are 22.2 and 106.3, respectively. Days to flowering under the short day treatment is about 56 days in the four season. The cultivar ‘My Bear’ has white petal with 8.0weeks to flowering under the short day treatment.