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METHODS AND MATERIALS
RESULTS AND DISCUSSION
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6m NPK zero amino nitrogen aphid arthropod Beetle densities biological Brassica oleracea Brussels sprout chemical chemistry Chrysomelidae cole crops Coleoptera collards composted concentrations conventionally grown Correlation cruciferae crucifers damage differences Ecol Ecology Econ effects Emden F statistic factors fecundity feeding Feeny field Figure five treatments flea beetles foliar nitrogen glucosinolate content glucosinolates growth herbivores host plant increased insect densities insect populations interactions larvae leaf tissue lepidopterans levels of nitrogen Lockeretz lOOmc methods mite myrosinase Myzus persicae nitrogen nitrogen content nitrogen fertilization nitrogen levels nutrients nutritional optimal organic agriculture Organic Farming organic growers organic matter oviposition parameters parasitism parasitoids pest insects pesticides Phyllotreta Pieris rapae Pimentel plant quality plant resistance plant tissue plotted on surfaces Plutella xylostella Population trajectories produced rates response sample dates sample week season secondary compounds sinigrin Slanski species striolata studies Table Tahvanainen U.S. agriculture untreated plants USDA vegetables