Like many organic farmers, one of Jeff Fiorovich’s biggest fears is that the apples, pumpkins and other crops he grows in Watsonville one day might be contaminated by genetically engineered varieties from a neighboring farm. [...] Assemblyman Jared Huffman, D-San Rafael, has introduced a bill, AB 541, that would require farmers to notify local county agricultural commissioners within 30 days of planting or testing genetically altered crops. It also would declare gene-manipulated plant contaminations that cause more than $3,500 in losses to be a nuisance, making it easier for organic farmers and others to sue.