Walsh said Arataki Honey hives were constantly checked for contamination, but the disease could take up to two years to develop.
Lawry began keeping his own hives in 2015.
He would separate the frames inside the hives and place them inside a nucleus (a wooden box with a queen bee and five wooden frames inside).
If successful, a nucleus can be sold for $250-$350.
Lawry had also been grazing stock on orchards where Arataki Honey hives were located and knew their locations.
Each year in 2016, 2017 and 2018 during pollination time, he drove on to different properties carrying his own nucleus full of new wooden frames.
He used a crowbar to lever open the lid of the Arataki hives and stole four frames from each one.
He put them in his nucleus and replaced the missing frames with empty ones.
He continued this every spring and did the same thing to four Kintail Honey beehives, near Hastings.
Lawry also continued targeting Arataki Honey and drove to their hive locations on Longlands Rd, Orchard Rd and Elwood Rd.
His luck finally ran out in November last year when he went to farmland on Taihape Rd.
Little did he know he was being watched by a hive manager and fled when he was approached - dumping his equipment on the way.
The manager took a photo of Lawry's vehicle and shared it on social media. Lawry was later located by police.
He admitted that between 2016/17 his hives were suffering and he became obsessed with helping his own bees regenerate.
Lawry will be sentenced in June.