This invention discloses a method for selecting watermelon rootstocks and for efficient
grafting cultivation to
resist continuous cropping.
Rootstock pools containing
gourd,
bottle gourd, pumpkin, and a dedicated F1 strain are constructed. Watermelon and
gourd-specific
Fusarium wilt pathogens are inoculated concurrently for initial screening (
disease index ≤10,
survival rate ≥90%) and secondary screening (
disease index ≤5,
survival rate ≥95%). Rootstocks are selected based on fruit setting
verification at 15 / 10℃ (day / night) (fruit setting rate ≥80%) and quality evaluation (
sugar content decrease ≤0.5°
Brix,
skin thickness increase ≤10%). Seedlings are raised using the
grafting method (rootstocks are sown 6-8 days in advance;
grafting is performed at the appropriate time; healing occurs at 25-28℃ for 5-7 days;
rootstock buds are removed after 10 days). At field
transplanting, biocontrol agents (≥1×10⁸ CFU / g, 2-3 kg / mu) are applied, EC ≤1.5 mS / cm is controlled, and 500-600 plants are planted per mu. Two-
vine training is used, selecting the second female flower for fruit setting. To achieve synergistic effects of
rootstock resistance spectrum and low-temperature fruit setting, reduce the risk of quality deterioration, quantify key parameters, reduce diseases, improve
survival rate and uniformity in replanted fields, promote early maturity and increase yield, and facilitate large-scale promotion.