Why we index every mother plant twice before it enters the line

Every mother plant that enters our multiplication line is virus-indexed twice, at two different growth stages, before a single explant is taken from it. It adds roughly a week to intake. Growers occasionally ask why, given the delay.

The answer is that a single false negative — a plant that’s carrying a low viral load undetectable at one screening point but detectable at another — propagates into every culture vessel descended from it. Banana Bunchy Top Virus (BBTV) and Cucumber Mosaic Virus (CMV) don’t announce themselves early; symptoms can lag infection by a full growth cycle, by which point tens of thousands of plantlets could already be dispatched.

Double indexing at intake, before multiplication begins, is the point where catching a positive costs a week. Catching it after multiplication, or after dispatch, costs a season — for us and for the grower who planted the block. It’s the same logic behind every checkpoint in our batch record: cheaper to catch a problem than to explain one.