88 MELON CULTURE 



fectly healthy and which apparently have the power 

 to resist or to throw off the disease. In fact, some 

 varieties seem to have that inherent quality, which 

 enables them to escape the disease, while others 

 in the same field succumb to it. This fact enables 

 the plant breeder to make his selections of fruits 

 for seed from these apparently immune plants, and 

 so, after a time, to produce a disease-resistant strain. 



Fig. 20. A well-sprayed melon vine. 



(Fig. 19.) Let it be understood, however, that a 

 disease-resistant strain which has been developed 

 in one section of the country will not necessarily 

 remain resistant when grown in some other locality 

 under very different climatic conditions. The tend- 

 ency, however, is for it to become resistant under 

 its new environments much quicker and more easily 

 than if it had never developed that quality. 



Experiments have proven that a resistant variety 



