Full text
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| Author(s): |
Tatiane de Oliveira Tokairin
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | Piracicaba. |
| Institution: | Universidade de São Paulo (USP). Escola Superior de Agricultura Luiz de Queiroz (ESALA/BC) |
| Defense date: | 2013-02-07 |
| Examining board members: |
Marcel Bellato Sposito;
Antonio Baldo Geraldo Martins
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| Advisor: | Marcel Bellato Sposito |
| Abstract | |
This research sought to identify several characteristics of white pulp gravas - \'Kumagai\' and red pulp guavas - \'Pedro Sato\', in relation to physic-chemical quality, incidence of post-harvest diseases and production costs. In order to fulfill the objectives, the experiment was conducted in Valinhos - SP, and the laboratorial analysis was performed at Escola Superior de Agricultura \"Luiz de Queiroz\". To evaluate physic-chemical qualities of two varieties of guava the fruits was bagged at two different development stages, 1,5 and 3,0 cm of fruit diameter. The bagging was realized using a simple white paper bags, double white paper bags and non-textured fabric (TNT). The non-bagged fruits were noted as control. The used methodology evaluated the weight of single fruit, fruit diameter, skin and pulp color, pulp firmness, sugar concentration, acidity, and ascorbic acid levels. In post-harvest guavas, the fruits were kept for one week at controlled temperature (25 ºC) and evaluated for the occurrence of the black spot disease (Guignardia psidii) and anthracnose (Colletotrichum spp.); for the presence or absence of larvae of fruit flies (Anastrepha spp., and Ceratitis capitata); and the abundance of chemical residues, applied to control insects and diseases in guavas. Finally, the economic sustainability of guava production was evaluated, through the comparison of the production costs of both bagging and non-bagging systems. The main results suggests that bagging with double white paper bags induced a shortening in the ripening process of \'Kumagai\' guavas; while in the \'Pedro Sato\' guavas, the shortening ripening process was induced by a simple white paper and TNT bags induced. The bagging process avoided anthracnose incidence in both varieties, although the bagging has resulted in the occurrence of black spot in post-harvest of Kumagai cultivar fruits. The production cost of bagged fruits was 8.6% higher than non-bagged fruit, however, both production systems have shown to be economically sustainable. (AU) | |
| FAPESP's process: | 11/04501-9 - Use of different materials and times of bagging on fruit quality of guavas's cultivars Kumagai and Pedro Sato in São Paulo |
| Grantee: | Tatiane de Oliveira Tokairin |
| Support Opportunities: | Scholarships in Brazil - Master |