Hay or straw dust can also cause sneezing. It is used in agriculture as a forage plant, grown for pasture, hay, and silage. Other crops in the area include sorghum, silage, hay, and soybeans. The available agricultural land consists of of arable land and of pasture and hay land. A few beetles consumed in a single feeding of alfalfa hay may be lethal. These trulli were for storage of grain, hay, or straw. The region was mostly suited for the cultivation of hay and cattle ranching. Wild boar rest in shelters, which contain insulating material like spruce branches and dry hay. Their grazing is typically supplemented with hay and concentrates. The fire was systematically stoked with hay and dry wood. Plants that produce windblown pollen invoke allergic reactions in people who suffer from hay fever. A duplicate experiment with a different sample of clover hay produced the same result. Traditionally, the festival commences with the burning of a thatched hut of hay and twigs. Roman mattresses were stuffed with reeds, hay, or wool. Risk factors include having conditions such as hay fever or asthma.