Kiwifruit industry in New Zealand level of infection by November 2011. Some of the attacks in the Bay of Plenty were by the virulent strain PSA-V. The disease is worldwide, with serious attacks in Italy and France also in 2011. In mid-2013 a China-based Zespri subsidiary was fined nearly $1M for under-declaring customs duties, and the Serious Fraud Office launched an investigation into Zespri itself in October 2013. Much of the breeding to refine the green kiwifruit and develop the gold Zespri was done by the Plant & Food Research Institute (formerly HortResearch) during the decades of 1970-1999. In 1990, the New Zealand Kiwifruit Marketing
Largest known prime number Largest known prime number The largest known prime number () is 2 − 1, a number with 23,249,425 digits. It was found by the Great Internet Mersenne Prime Search (GIMPS) in 2017. Euclid proved that there is no largest prime number, and many mathematicians and hobbyists continue to search for large prime numbers. Many of the largest known primes are Mersenne primes. , the seven largest known primes are Mersenne primes. The last sixteen record primes were Mersenne primes. The fast Fourier transform implementation of the Lucas–Lehmer primality test for Mersenne numbers is fast compared to other known primality tests