Effect Of Intercropping System On Green Peach Aphid Dinamics On Organic Farming Of Potato 
In Karo Highland

Abstract: Green peach aphid (Myzus persicae Sulzer) represents one of the major pest affecting decreased production which found in different potato fields in Karo Highland. This study was conducted to determine the population dynamics of Myzus persicae (Sulzer) on potato cropping system. The experiment was laid out in split plot design with main plot are farming system such as: conventional farming, semi organic farming and organic farming. The sub plot are intercropping system consist of: potato monoculture, potato with cabbage, potato with mustard, potato with celery, potato with cabbage and mustard, potato with cabbage and celery, potato with mustard and celery, potato with cabbage, mustard and celery. Research carried out for two planting season. The first at May-August and the second at September-December. The results showed that M. persicae was consistently at different densities in different intercropping system on potato. The aphid was first recorded at three week until planting. The kind of intercroppingculture plants significantly reduced the number of aphid at two planting season. Intercropping system decrease population of M. persicae at potato. At 9 weeks after planting, the decreased are respectively at intercropping potato with mustard (3.97 aphid/leaf), potato with cabbage and mustard (4.43 aphid/leaf) and potato with celery (4.45 aphid/leaf). At 11 weeks after planting, the decreased are respectively at intercropping potato with mustard (2.99 aphid per leaf), potato with cabbage (3.10 aphid/leaf) and potato with cabbage and mustard (3.60 aphid/leaf). At 7 weeks after planting, the highest population of natural enemies Braconid wasp was found on intercropping potato with cabbage(2.62 braconid wasp/plant) and at 9 weeks was found on intercropping potato with cabbage, mustard and celery (2.38 braconid wasp/plant). The highest population of Coccinellidae found on intercropping potato with cabbage, mustard and celery (1.80/plant) at 11 weeks after planting.

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