Seasonal occurrence of Piezodorus guildinii on different plants including morphological and physiological changes

摘要: Piezodorus guildinii (Westwood) is an important soybean pest in the Americas. Current knowledge about its ecology limited. To implement holistic and sustainable management programs, it necessary to understand how biotic abiotic factors regulate population. Seasonal occurrence on different host plants, morphological (body morphometry color) physiological (lipid content development of reproductive organs) changes adults, were studied. Weekly samples conducted during 2 years Medicago sativa, Trifolium pratense, Lotus corniculatus (Leguminosae), Pittosporum undulatum (Pittosporaceae), Ligustrum lucidum (Oleaceae), Phyllostachys sp. (Poaceae), leaf litter Eucalyptus (Myrtaceae) at survey sites (between 33°55′ 34°17′S). On forage legumes, both nymphs adults intercepted, whereas shrubs, bamboo, eucalyptus only captured. Alfalfa was legume which collected almost entire year. In this plant species, abundance higher comparison with other plants species overwintering niches. From beginning autumn spring, observed foliage shrubs bamboo. During winter, underneath litter. had accumulated lipids reserves, showed undeveloped organs, smaller body size, females clear coloration pronotum band connexivum, indicating diapause. Results suggest that control P. spring alfalfa may reduce population bugs before they colonize soybean.