畸形果是扁平瓜、歪瓜、葫芦瓜的总称。西瓜果实在发育过程中,遇到不良气候条件或栽培不当容易形成畸形果实,使产量和商品性降低,直接影响农民的收益。 扁平瓜 主要发生于圆果型品种,因西瓜果实纵径和横径发育速度不均衡所致。西瓜果实发育的特点是前期以纵向发育为主,中后期以横向发育为主。如果果实发育前期气温较低,果实纵向发育速度缓慢,难以达到应有的发育速度;果实发育中后期气温适宜,果实横向发育速度加快,从而形成横径大于纵径的扁平果实。扁平瓜的外部特征是果肩部较宽,果蒂都呈凹陷 Deformity fruit is flat melon, crooked melon, gourd melon general. Watermelon fruit in the development process, encountered adverse weather conditions or cultivation is not easy to form deformed fruit, so that the yield and reduce the direct impact on farmers’ income. Flat melon occurs mainly in the round fruit varieties, due to watermelon fruit length and diameter growth rate is not balanced. Watermelon fruit is characterized by the development of the main pre-longitudinal development, mainly in the late lateral development. If the temperature is low during the early stage of fruit development, the fruit will grow slowly longitudinally and it will be hard to reach the proper growth rate. The mid-late stage of fruit development will be suitable for temperature and the horizontal development of fruit will be accelerated. The outer feature of the flat melon is that the shoulder of the fruit is wider and the pedicle is hollow