Plant cabbage with tomato or garlic to reduce insect pest damage [Batac City, Ilocos Norte, Philippines]

agriculteur agricultores allium sativum augmentation de rendement aumento del rendimiento brassica oleracea capitata companion crops cultivo mixto cultivos asociados cultural methods environmental factors facteur du milieu factores ambientales farmers filipinas lycopersicon esculentum mixed cropping mode de culture philippines plutella xylostella productividad productivity yield increases