Fruit Protection Paper Bag

Fruits are influenced by both biotic and abiotic factors that determine their quality. To achieve high-quality fruits, various agronomical approaches are available, among them preharvest bagging (bagging the developing fruit prior to harvest) to improve fruit morphology, reduce fruit residues on the surface, control insect pests and diseases, and promote fruit maturation.

Bagging can be done with several materials, including paper, aluminum, and a combination of both. In addition to improving fruit morphology, a bag also protects the fruits from adverse weather conditions and increases the shelf life of the fruit. The use of a bag can increase fruit production and yield by up to 30%, which is beneficial for the grower. However, it is important to choose the right type of bag. Ideally, the bag should be made of a thick, strong material and should have a low light transmittance to allow for proper sunlight penetration during growth.

Paper bags are the most common choice for bagging guava because of their air-permeability, strength, and water resistance. They can withstand strong winds, heavy rains, and other adverse weather conditions. Moreover, they can be used for a longer period of time than plastic film bags. In addition, they do not contain any chemicals and can protect the fruit from insects, fungi, and other contaminants.

According to a study conducted by Xu et al., the use of different types of bags had a significant impact on the development and quality of loquat. The researchers divided the fruit into four groups: a control group without bagging, a group bagged with one-layer kraft paper with 50% light transmittance (Ta), a group bagged with aluminum foil having one side of 80% long and 20% short fibers and another side of polyethylene with 0% light transmissivity (Tb), and a group bagged with two-layered kraft papers with 50% light transmittance on both sides (Tc). Bagging promoted fruit ripening and quality, especially in terms of firmness, sugars, acids, phenolics, and proline. In addition, bagging improved the color of loquat fruits.

The researchers from Clemson University found that using specialized bags can help homeowners enjoy fresh, nutritious homegrown fruit without the need for weekly applications of insecticides. The specialty bags completely encase the fruit, reducing the chances of insect attack and preventing fungi from growing on the fruit. The bags also allow for proper sunlight penetration to encourage the red blush of peaches and apples. These benefits are especially helpful for the southeastern United States climate, where fungus and insect infestation are common problems.