PLNT 1213 Lecture Notes - Lecture 16: Tamarix, Pesticide Resistance, Cyperus Esculentus
Document Summary
Cultural control: managing the growing environment using cultural practices. Biological control: introduction of an animal/insect/microbial species to that is a natural enemy of the pest. Mechanical control: using physical methods to control pests. Chemical control: using pesticides to kill or prevent pest infestation. A plant growing where it is not wanted. Weeds cost american farmers about b each year: competition, reduce quality, decrease irrigation efficiency, interfere with harvest. The more closely related the weed and crop, the more difficult to control. Climbs crop plants to compete for sunlight. Pigweeds: (amaranthus spps, principle issue: resistance to roundup. Silverleaf nightshade: (solanum elaeagnifolium, leaves and berries contain alkaloids that are toxic to people and livestock. Johnsongrass: (sorghum halapense, closely related to sorghum. Yellow nutsedge: (cyperus esculentus, triangular stem, forms symbiotic relationship with a nematode that infests crop plants, found in wet areas.
