Bugs?

[Rozzyman]

Hello there,

5 weeks into flowering a northern lights strain and few top bud pistols are drying and turning brown. Have no idea what is going on

 

[Islandgrow]

Could be budrot has it been real humid lately?

 

[daTenshi]

That looks like rot to me too. Cut it open and clear all necrotic areas. Check for any caterpillars or like Islandgrow mentioned high humidity can also be to blame.