author(s)
Binari Manurung, Ashar Hasairin, Abdul Hakim Daulae, Putri Septiana Silaban and Nurjannah Hasibuan

abstract
The present work emphasizes on the morphometric study of white leafhopper Cofana spectra at three districts in Tapanuli region-Indonesia. The research sample was taken from the rice fields located in Toba Samosir district (Tampubolon Sariburaja village), Samosir district (Sigaol Simbolon village), and Tapanuli Utara district (Simorangkir Julu village). The morphological traits that be meansured are body length, width body, head length, head width, stylet length, thorax length, abdomen length, wing length, wings width, leg length and ovipositor length. The morphometric features measuring were done by using sofware Carl Zeiss Imaging System Axio Vision LE Release 4.8.2 under Stereo Zeiss-Stemi 2000-C microscope. Morphometric differentiation of leafhopper between male and female in Tapanuli area was analyzed by using the Mann-Whitney test (U), Wilcoxon (W) and Z tests. Meanwhile among the three districts were analyzed by using Kruskal-Wallis test (X²). The relationship among body length and other morphological traits be analyzed by stepwise multiple regression with the helping of Software IBM SPSS Statistics 22.The research result showed that the female size of white leafhopper Cofana spectra was very significantly larger (p<0.01) than in males. The male and female morphometric among the three districs were also very significantly different (p<0.01). The significant difference among males morphological traits at three districts were the body length, body width, head length, head width, thorax length, wings width and the leg length, whereas among females were body width, head width, stylet length, thorax length, abdomen length, wing length and the leg length. Further, in relationship among body length (Y) toward other morphological traits (_X2-10), the research result showed that the abdomen length has the highest contribution in male (Y= 5.39 +0.52X₆, r²=25.1%), meanwhile in female, it was the wing length (Y=3.77+ 0.68X₇, r²=38.4%).