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Leptine (LP) glycoalkaloids have been demonstrated to confer natural resistance to the Colorado potato beetle (CPB) in  Solanum chacoense  ( chc ). Development of cultivated potatoes with natural resistance to CPB has the potential to reduce both costs and environmental impacts of production by reducing pesticide use. To introgress the genes conferring leptine production from  chc  into  S. tuberosum  ( tbr ), clones of  chc  have been crossed with clones of S.  phureja . Leaf disks from eight hybrids were subjected to a CPB second instar feeding bioassay to determine if extent of feeding was related to LP levels. Most hybrids contained leptinidine (LD, the aglycone of LP) levels intermediate to  chc  and  tbr , and insect feeding was suppressed 30% to 50% in hybrids containing &gt;10 mg·g –1  DW LD. One hybrid displaying feeding suppression contained a very low level of LD, whereas another hybrid that contained higher levels of LD had higher feeding rates. The presence of LD at “threshold” levels in these hybrids will suppress feeding of CPB, but other factors affecting resistance are also present and need to be explored.

Leptine-based Resistance to Colorado Potato Beetle among Interspecific Hybrids of Wild Potato