陳紹崇 李垂芳 程永雄
西瓜根瘤線蟲為西瓜旱地栽培時之一重要病害，影響產量至鉅。本研究即以不同處理於各地區進行試驗，以期尋求一防治方法。結果顯示覆蓋塑膠布於土表，先利用太陽能之熱力殺死土中根瘤線蟲Meloidogyne incognita後，再接種內生菌根菌Glomus clarum，有增進植株生長之作用。以內生菌根菌土培育扁蒲苗為砧木嫁接西瓜，再移植於根瘤線蟲感染土中，無論盆栽或田間試驗，發現內生菌根菌株苗對西瓜生育初期的生長有促進之效果，並保護根部減少受根瘤線蟲危害，台南試區增產19％，而雲林試區增產34％。施用SH土壤改良劑並配合施用托福松粒劑（10％ Counter G.）；或單獨施用托福松粒劑；或以溴化甲烷燻蒸土壤，均可降低土中根瘤線蟲密度；促進西瓜植株生育情形；增加產量，尤其以溴化甲烷增產效果最大，在山上試區增產32％；二崙試區更增產68％，此外單獨施用SH土壤改良劑或單獨施用烏肥，雖無法降低土壤中線蟲密度，但可增加植株之耐病性，提高產量。
Studies on the Control of Meloidogyne Incognita on Watermelon
S. C. Chen, C. F. Lee and Y. H. Cheng
Root knot of watermelon caused by root knot nematode (Meloidogyne incognita) is one of the most serious diseases limiting the production of watermelon in Taiwan. Experiment was conducted in filed at various locations with combination of different treatments to explore the method for the control of this disease. Results indicated that plant growth was increased in the soil inoculated with VA-mycorrhizae (Glomus clarum) after nematodes were killed by solarizing the soil covered with PE sheet before planting. When watermelon scion was grafted onto the rootstock of bottle gourd growing in the nursery soil containing mycorrhizal, the growth of watermelon plants was improved after transplanting even in the soil infected with root knot nematode. Yield was increased 19% and 34% in the Tainan plot and Yuinlin plot, respectively. Nematode population was decreased in the soil incorporated with SH-soil mixture plus nematicide (10% Counter G.) Counter G. only, or fumigated with methyl bromide, thus, plant growth was promoted and yield was increased. The best results were observed in methyl bromide-fumigated plots in Sanshang and Erhlun, which increased 32% and 68% of yield, respectively. Although sole application of SH-soil mixture or CaCN2 failed to decrease nematode population, but they increased tolerance of the plants and thus yield was increased.