Sunflower pest population levels in relation to date of planting on the texas usa high plains Mitchell, T.L.; Bynum, E.D.; Ward, C.R.; Teetes, G.L.; Schaeffer, C.A.; Brigham, R.D. Southwestern Entomologist 3(4): 279-283 1978 0147-1724 https://eurekamag.com/research/006/541/006541901.php