Population abundance and vertical distribution pattern of the pea leaf miner, Liriomyza huidobrensis (Blanchard) (Diptera:Agromyzidae) and its natural enemies in potato, Solanum tuberosum L. as affected by vermicompost and reflective plastic mulch
2006
Ida Bagus Gde Suryawan
The population abundance and distribution pattern of Liriomyza huidobrensis Blanchard and its natural enemies in potato as affected by vermicompost and reflective plastic mulch was studied during the cropping season (August-November) in year 2004 at Bali, Indonesia. The results show that the larvae and adults of L. huidobrensis as well as the population of other pests were lower in plots with recommended package of technology plus reflective plastic mulch (CM) and in plots with vermicompost plus, reflective plastic mulch (VM). Adult flies were distributed in the upper parts of the plant while the larvae were found in the lower parts. Vermicompost and reflective polastic mulch did not affect the vertical distribution of the pea leafminer. Three parasitoid species namely Hemiptarsenus varicornis (Girault), Neochrysocharis sp. And Opius sp. were abundant in the field. In vermicompost (V) and VM treatments the number of parasitoid increased progressively starting at 4 weeks after planting (WAP) while in other treatments (Control, Farmer practices and CM) it had reached a plateau after 9 WAP. These results indicate that reflective plastic mulch was able to reduce the population of leafminer bud had no effect on the population of parasitoids. Leaf area and leaf nitrogen are not correlated to damage intensity caused by either leafminer or all leaf pests. VM gave the most satisfying results in suppressing pests' population, enhancing population of leafminer parasitoids, reducing plant damage and producing higher yield.
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