KERAGAMAN SERANGGA DIURNAL PADA PERKEBUNAN JERUK DI DESA TONGKOH, KECAMATAN DOLAT RAYAT, KABUPATEN KARO

The aims of the research were to determine the diversity, abundance, dominance index, uniformity index and environmental physico-chemical factors in citrus plantation areas in Tongkoh Village, Dolat Rayat District, Karo Regency. Sampling with purposive sampling. Installation of yellow sticky trap and sweep net at high and low areas in the area of each 2500 m2. Insect identification was carried out in the entomology laboratory of the UNIMED biology department. The results showed 16 species of insects from 5 orders (Coleoptera, Diptera, Hemiptera, Homoptera, and Orthoptera). The predominant diurnal insect is Bactrocera dorsalis (D = 0.8378%). The insect dominance index uses the yellow sticky trap method in the area (T) high D = 0.65 and the area (R) is low D = 0.86 was high category. For the sweep net method in the high area (T) D = 0.31 and the area (R) is low D = 0.15 both were low category. The diversity index of diurnal insects in citrus plantation areas in Tongkoh Village, Dolat Rayat District, Karo District was in the moderate category (H ’= 2,003). Insect diversity index using sweep net in low area (R) H = 0.93 and area (T) high H = 0.84 classified as low. The most abundant diurnal insects in both methods were Bactrocera dorsalis in the sweep net method Y ́ = 11, 83% and in the yellow sticky trap method Y = 93.66%. The uniformity index in the low area (R) (E = 0.641) and in the high area (T) (E = 0.620) was high category. Based on measurements of environmental physical chemical factors carried out in citrus plantation areas in Tongkoh Village, Dolat Rayat District, Karo Regency, it has an average temperature of 21-21.30 C, humidity 85-85.3% and soil pH averaged 63-6,8.