Experiments were conducted during three seasons to quantify the relationship between yields of late-maturing potato variety and variation in densities of second-generation larvae of the Colorado potato beetle (CPB), Leptinotarsa decemlineata (Say), in Connecticut and to develop alternative strategies to regular insecticide applications for maintaining commercially acceptable second-generation C...

Eight limonoids, named moluccensins R-Y (1, 2, 5-10), and six known compounds, including 6-hydroxymexicanolide (3), were isolated from the seeds of an Indian mangrove, Xylocarpus moluccensis, collected in the estuaries of Andhra Pradesh. The absolute configuration of moluccensin V (7) was confirmed by means of single-crystal X-ray diffraction analysis. The (1)H and (13)C NMR data for 6-hydroxym...

Sauriols A and B belong to a class of diarylbutane-lignans and exhibit antifeedant activity. We succeeded in the first synthesis of sauriols A and B by using a simple and efficient asymmetric dimerization of a cinnamic acid derivative as the key step.

Leucosceptroids A and B are sesterterpenoids with potent antifeedant and antifungal activities. A more efficient gram-scale total synthesis of leucosceptroid B and the first total synthesis of leucosceptroid A are presented. The key transformations include an aldol reaction between a substituted dihydrofuranone and an (S)-citronellal-derived aldehyde, a SmI2-mediated intramolecular ketyl-olefin...

1 The attractiveness of potato plants treated with a synthetic host volatile blend [(Z)-3-hexenyl acetate (þ/–)-linalool, and methyl salicylate] to newly emerged and 5-day-old adult Colorado potato beetle, Leptinotarsa decemlineata (Say), was compared at four doses against untreated control plants and plants treated with an azadirachtin-based antifeedant in greenhouse cage arenas. 2 Attractant-...

Helicoverpa armigera Hübner is one of the most important agricultural crop pests in the world causing heavy crop yield losses. The continued and indiscriminate use of synthetic insecticides in agriculture for their control has received wide public apprehension because of multifarious problems, including insecticide resistance, resurgence of pest species, environmental pollution, and toxic hazar...

Plutella xylostella cause considerable harm to the production of broccoli, Chinese cabbage, cabbage and cauliflower. The control P. is mainly performed using commercial insecticides, which have even led emergence resistant populations. Two easily available natural products found in different plants essential oil, thymol eugenol, stand up as possible novel agents this pest. In work a series alky...

The biological activities of natural abietane acids and their derivatives have been reviewed from 1967 to 1992. Antimicrobial, antiulcer, and cardiovascular activities are the most representative for this class of diterpenoids, while others like allergenic, antiallergic, filmogenic, surfactant, antifeedant, etc. activities, which determine several uses of abietane acids, have also been reported.