All grasses (including grains such as corn)
Cool-season vegetables (e.g., lettuce, broccoli, cauliflower)
Many monocots (e.g., lilies, irises, palms, bamboos, orchids)
Nightshade family plants (potatoes, eggplant, tomatoes)
Here's how to deal with dodder:
Use certified weed-free seeds. (Contaminated seed was a major cause of dodder infestation until many states adopted laws that prohibit the presence of dodder seed in planting seed.)
Keep weeds controlled. Weeds such as field bindweed, lamb's-quarter, pigweed, and nightshade are hosts for dodder.
Remove any infestations before dodder goes to seed in late summer. Small areas can be cleared by hand; larger areas require mowing, pruning, or burning. The seed survives soil solarization.
If you have had a dodder infestation, replant the area with nonhost plants.
Spray serious dodder infestations with vinegar (acetic acid), but be aware that this destroys both dodder and the host plants.