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Optimum timing of insecticide applications against diamondback moth Plutella xylostella in cole crops using threshold catches in sex pheromone traps
Author(s) -
Reddy Gadi Venkata Prasad,
Guerrero Angel
Publication year - 2001
Publication title -
pest management science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.296
H-Index - 125
eISSN - 1526-4998
pISSN - 1526-498X
DOI - 10.1002/1526-4998(200101)57:1<90::aid-ps258>3.0.co;2-n
Subject(s) - diamondback moth , plutella , cartap , brassica oleracea , biology , pheromone trap , pest analysis , toxicology , crop , population , horticulture , sex pheromone , infestation , agronomy , pesticide , larva , botany , demography , sociology
Field trials were conducted in cabbage ( Brassica oleracea var capitata ), cauliflower ( B oleracea var botrytis ) and knol khol ( B oleracea gongylodes ) crops at two different locations in Karnataka State (India) to optimize the timing of insecticide applications to control the diamondback moth, Plutella xylostella , using sex pheromone traps. Our results indicate that applications of cartap hydrochloride as insecticide during a 12–24 h period after the pheromone traps had caught on average 8, 12 and 16 males per trap per night in cabbage, cauliflower and knol khol, respectively, were significantly more effective than regular insecticide sprays at 7, 9, 12 or 15 days after transplantation. This was demonstrated by estimation of the mean number of eggs and larvae per plant, the percentage of holes produced, as well as the marketable yield of the three crops at each location. A good correlation between the immature stages, infestation level, the estimated crop yield and the number of moths caught in pheromone traps was also found, indicating the usefulness of pheromone‐based monitoring traps to predict population densities of the pest. © 2001 Society of Chemical Industry