Journal of Food, Agriculture and Environment
Vol 8,
Issue 3&4,2010
Online ISSN: 1459-0263
Print ISSN: 1459-0255
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Relay-intercropping into tomato decreases cabbage pest incidence
Author(s):
Q. C. Xu 1,3,
H. L. Xu 1*, F. F. Qin 2, J. Y. Tan 1, G. Liu 3, S. Fujiyama 4Recieved Date: 2010-07-10, Accepted Date: 2010-10-30
Abstract:Relay intercropping, a crop is intercropped into another crop a short time before its harvest, has been adopted in integrated pest management. In the present study, a fall cabbage was intercropped into tomato and dynamic changes in population of pest insects, mainly Pieris rapae and Plutella xylostella, during the growing period were examined and analyzed with a mathematic model as P1 = PB1 + {Pmax1 – PB1 – PY1[1 – β1(t-τ)2]}EXP[-α1(t-τ)2] + PY1[1-β1(t-τ)2] (t≤τ) and P2 = PB2 + {Pmax2 – PB2 – PY2 [1-β2(t-τ)2]}EXP [-α2(t-τ)2] + PY2[1-β2(t-τ)2] (t≥τ), where Pmax is the maximum quantity of pest insects; PB is the base value of P at the beginning of pest insects occurring; PY is the increment from PB to the point at which the quantity of the pest insects began to increase rapidly; τ is the time point for the quantity increase to reach the peak of Pmax; α is the rapid growth or drop constant; β is the slow growth or drop constant; t is the time (day). The density of pest insects was higher in mono-cultured plots than in intercropping plots. Two cultivars of cabbage were also significantly different in pest incidence, with less dense pests in “Shoshu”. However, the damage index was not exactly consistent to pest inset density. ‘Shinshu 868’ in mono-cultured plots with the highest density of insects showed the lowest PDI of 36.0, while ‘Shoshu’ in relay-intercropping plots with the lowest density of insects showed the highest PDI of 58.8. It was concluded that relay-intercropping of cabbage into tomato decreased the level of pest incidence in the cabbage crop. It was speculatively suggested that shelter by tomato plants to cabbage might have prevented adult insects from laying eggs on the cabbage plants and consequently decreased the insect density.
Keywords:Cabbage,
intercropping, integrated pest management (IPM), mathematic modeling, Pieris rapae, Plutella xylostella, population dynamicsJournal: Journal of Food, Agriculture and Environment
Year: 2010
Volume: 8
Issue: 3&4
Category: Environment
Pages: 1037-1041
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