ABSTRACT
We!investigate!the!effect!of!chitosan!coatings!to!kill!the!immature!stages!of!Anastrepha$ludens! (Mexican!fruit!
fly)!in!mango! fruits! (cv.!Ataulfo).!The! fruits!were!effectively!infested!after!exposure! of! 4! h! to!gravid! females.!
Larvae!of!first,!second!and!third!instars!were!found!inside!the!fruits!3,!7!and!10!d!after!oviposition.!No!embryos,!
first!or!second!larval!instar!was!developed!when!the!fruits!were!coated!0.5,!2,!4!and!8!d!after!oviposition.!We!
suggest!the!mass!transfer!(CO2!and!O2)!modification!can!be!implicated!in!those!results.!!In!contrast,!application!
of!chitosan!after!10!d!of!oviposition!did!not!kill!the!insects.!In!this!case,!more!of!90%!of!the!insects!emerge!as!
adult!flies,!value!similar!to!the!developed!in!uncoated!fruits.!The!main!reason!for!this!result!was!that!the!fruits!
had!significant!loss!of!firmness!and!it!difficult!the!homogeneous!formation!of!chitosan!coating.!
 
ABSTRACTWe!investigate!the!effect!of!chitosan!coatings!to!kill!the!immature!stages!of!Anastrepha$ludens! (Mexican!fruit!fly)!in!mango! fruits! (cv.!Ataulfo).!The! fruits!were!effectively!infested!after!exposure! of! 4! h! to!gravid! females.!Larvae!of!first,!second!and!third!instars!were!found!inside!the!fruits!3,!7!and!10!d!after!oviposition.!No!embryos,!first!or!second!larval!instar!was!developed!when!the!fruits!were!coated!0.5,!2,!4!and!8!d!after!oviposition.!We!suggest!the!mass!transfer!(CO2!and!O2)!modification!can!be!implicated!in!those!results.!!In!contrast,!application!of!chitosan!after!10!d!of!oviposition!did!not!kill!the!insects.!In!this!case,!more!of!90%!of!the!insects!emerge!as!adult!flies,!value!similar!to!the!developed!in!uncoated!fruits.!The!main!reason!for!this!result!was!that!the!fruits!had!significant!loss!of!firmness!and!it!difficult!the!homogeneous!formation!of!chitosan!coating.!
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