Spore dimensional characteristics of Peronosclerospora sp. from corn leaves informer of sugar cane plantation

Abstract

Corn and sugar cane are two types of plants that have the same host of the pathogen Peronosclerospora sp as cause of a seriously downy mildew disease. So that replacing sugar cane cultivation with corn plant is somewhat unfavourable. In Indonesia, downy mildew causes a yield loss of 50-100% on susceptible varieties. In this study, have been done a collection of spores from corn leaves infected with Peronosclerospora sp. from community corn cultivation who planted on PTPN2‘s former of-sugar cane field, namely Sei Mencirim Sunggal village and from corn plant who growth on community land non former of-sugar cane from Lau Bekri village, Pancur Batu village, and Tanjung Anom Deli Serdang village. The objective of this study was to find out the characteristics of the spores’ dimension of Peronosclerospora sp. which has infected corn leaves from different source area as mention above. The results computation of ratio length and width of the spore’s origin of Pancur Batu is 1.35 ± 0.19, Lau Bekri 1.24 ± 0.1, and Tanjung Anom 1.27 ± 0.14, these ratios shown that the dimensions of spores are subspherical, while the ratio spores origin from Sei Mencirim is 1.02 ± 0.05 or shown spherical dimension shape.