Effects of companion planting and plastic mulch on yield and egg mass density of common cutworm (Spodoptera litura F.) in broccoli
2001
Pornthip Pornsuriya | Pramote Pornsuriya(Rajamangala Institute of Technology. Bangphra Campus, Chon Buri (Thailand). Faculty of Agriculture)
Study mainly aimed to enhance broccoli production to higher yield and reduce pesticide use. The experiment was conducted during September 15, 1999 to January 25, 2000 using split plot design with three replications. Two main plots randomly arranged in complete blocks were encompassed and non-encompassed plots with citronella grass. Four sub plots were, broccoli with plastic mulch, sole broccoli, broccoli-tomato and broccoli-sacred basil companion planting. The results obviously showed that plastic mulch enhanced yield/plant and yield/ha of broccoli (525 g/plant and 13.3 t/ha, respectively), comparing to non-culch (391 g/plant and 9.66 t/ha, respectively). There were no significant differences in yield/plant among sole broccoli, broccoli with tomato and broccoli with sacred basil. Regarding insect pests, number of common cutworm egg masses on broccoli leaves was checked for three times during three weeks before harvesting. Plastic mulch and comparion planting with tomato did not affect number of the egg masses (0.45 and 0.40 masses/plant, respectively), whereas companion planting with sacred basil gave the lowest number of the egg masses (0.27 masses/plant), comparing to sole broccoli (0.42 masses/plant). In regard to the effects of surrounding plant, citronella grass had no effects both on yield of broccoli and on number of the egg masses.
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