silk pillowcase question

I am all set to order a CurlMart silk pillowcase but someone mentioned to me that silk is heavily sprayed with pesticide, just wondering if anyone is concerned with this. Of course on other hand unless we are using organic cotton, cotton is the most heavily sprayed. brit
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[SIGPIC][/SIGPIC]
3A/B? A corkicelli mix of ringlets, spirals, helixes & s-shaped curls
Medium-fine texture, normal porosity, normal elasticity
Summer: pink; Winter: Blue; Year Round: green
Lo-Poo:Giovanni SAS sulfate free poo, L'Oreal Evercream CC
Co-wash: TNRV, VO5 Vanilla Mint Tea, TNNM
RO/LI: YTC, Nexxus Hydra-light w/ CNPF GVPCB, Biolage CB, TNNM, Giovanni SAS
Styler: KCCC FSG, BRHG, LALSG