Effect of Marigold Extract and Intercropping of Soybean With Marigold on Population of Soybean Aphid, Aphis glycines Matsumura and its Natural Enemies

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ณฐพงศ์ เมธินธรังสรรค์

Abstract

                    The study of efficiency of marigold extract, Tagetes erecta (L.) as Insecticidal and repellency was tested on 4 days of soybean aphid, Aphis glycines Matsumura. The various concentrations of marigold extract 0.3125, 0.625, 1.25, 2.5 and 5% (w/v) were applied. The treatments were arranged in a completely randomized design (CRD) and replicated 5 times on 10 adults and experiment was conducted at laboratory biology at temperature (25-27°C) and RH (75-80%). The experiment field was carried out at Pathum Thani province to assess the effects of marigold and soybean intercropping on a population of soybean aphids, a number of natural enemies and insect bio-diversity. The experiment design was a randomized complete block design (RCBD) with four treatments each of which was replicated three times. Each of the 12 plots were measured 7 m x 5 m were used the experiment. The distance between inter and intra row spacing for all treatments were 70 x 50 cm with 1 m spacing between plots. The intercropping treatments were: sole soybean (T1), 1 row of soybean with 1 row of marigold (T2), 2 rows of soybean with 1 row of marigold (T3) and 3 rows of soybean with 1 row of marigold (T4). The results found that the insecticidal and repellent of marigold extract on soybean aphid were significantly effective (p<0.05) when compared with the control. At 5% of marigold extract, the percent mortality was the highest 92% and LC50 value with 0.435% at 48 hours and the percent repellent was the highest 100% at 24 hours. The intercropping soybean with marigold had lowest significant (p<0.05) effect on a population of soybean aphids, a number of natural enemies and insect bio-diversity when compared with the sole soybean. The 1 row soybean + 1 row marigold were the lowest a population of soybean aphid from week1 to week6 when compared intercropping others value with 30.33+1.24, 48.66+0.61, 68.33+1.69, 80.33+1.69, 116.66+1.24 and 145.33+1.63 adults/ 5 soybeans. The natural enemies were the highest, the black ants (47.66+1.24), ladybird beetles (36.66+1.24), dragonflies (18.33+0.47) and spiders (18.33+0.47) and the insect bio-diversity was 1.85 when compared with the sole soybean.

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References

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