Where do I go wrong here?

[Rod]

Sorry if this one is a bit of a no brainer guy's, but was reviewing a cash session from last night and this hand has me confused. I am pretty sure my line is poor and I should be either folding the turn or calling the river. I only have 50 hands on the Villain but he is very loose and is playing 78/27. He has bet a lot but normally only small bets.
 
PokerStars - $0.25 NL (9 max) - Holdem - 9 players
Hand converted by PokerTracker 3

MP: $33.84
MP+1: $29.20
LP: $14.57
CO: $31.41
BTN: $46.26
SB: $9.40
BB: $26.78
Hero (UTG): $25.00
UTG+1: $10.00

SB posts SB $0.10, BB posts BB $0.25

Pre Flop: ($0.35) Hero has  A:club: K:spade:

Hero raises to $1.00, fold, fold, fold, fold, fold, BTN calls $1.00, fold, fold

Flop: ($2.35, 2 players)  4:heart: K:club: 9:diamond:
Hero bets $2.00, BTN calls $2.00

Turn: ($6.35, 2 players)  4:club:
Hero bets $3.50, BTN raises to $7.00, Hero calls $3.50

River: ($20.35, 2 players)  Q:heart:
Hero checks, BTN bets $36.26 and is all-in, fold

BTN wins $19.35

[cambridgealex]

perfect imo. wp

[EvilPie]

I would've called the river.

I usually lose these hands.

WP.

[Rod]

perfect imo. wp

Should I not make a decision on the turn and stick with it? As I have to act first OTR.

I can't fold to the min raise to the turn can I? Or can I?

I would've called the river.

I usually lose these hands.

WP.

I seem to lose most of the hands I play *lol*

[spence]

perfect imo. wp

Should I not make a decision on the turn and stick with it? As I have to act first OTR.

I can't fold to the min raise to the turn can I? Or can I?

it depends.  this could easily be a marginal hand looking to showdown cheap, intending to check the river back and have you fold equity sometimes.  If he habitually bombs the river after raising turn then your line is setting money on fire.

VPIP/PFR dont tell us much here other than that he could have a 4 here.  Look at aggression frequencies on turn and river, what he usually does to a turn cbet etc.

In the absence of more illuminating information and assuming you haven't seen a river shove from him before, i agree with alex that your line is fine. 

[spence]

In the absence of more illuminating information and assuming you haven't seen a river shove from him before, i agree with alex that your line is fine. 

screw that.  Just double checked your stack and the river shove is only for $15 effective not $36.  in the absence of information i'd call now

[pleno1]

call. spew factor.