<p>Even before real-estate mogul Donald Trump called undocumented immigrants "rapists and murderers" who "have to go," California contractor Carlos Castañeda was having difficulty hiring enough workers to pick celery and squash.</p><p>Now Castañeda and others fear <a href="https://www.donaldjtrump.com/images/uploads/Immigration-Reform-Trump.pdf" target="_blank">Trump's talk about erecting a "big beautiful wall" </a>at the border and deporting millions could make it near impossible to find the guest workers they need, and who would obtain legal status under most comprehensive reforms bills.</p><p>"There are growers out there screaming for labor," said Castañeda, a farm labor contractor in San Luis Obispo County in central California.