than other varieties. Its derivatives significantly increased sugar cane production in the Philippines. Between 1921 and 1939, cattle, poultry, and swine breeding programs produced new breeds, namely the Philamin (a hybrid of the Hereford, Nellore and native cattle), Berkjala (a variety of the Berkshire and local Jala-Jala pig, resistant to hog cholera) and the Los Baños Cantonese chicken, which produces more eggs. Research in the 1960s allowed for the efficient mass production of macapuno (a type of coconut with jelly-like meat), while studies started in 1998 that produced delayed-ripening papaya continue to this day. The research is credited for the increase in Philippine papaya production, with the production of year 2000 rising to in 2007. In 1974, UPLB researchers discovered mango flower induction by potassium nitrate, making it possible for the fruit to be available year-round. It is credited for tripling yield and for "revolutionizing" the country's mango industry. In 2009, UPLB researchers funded by the Department of Agriculture developed an abacá variety that is resistant to the abaca bunchy top virus. The virus, first detected in 1915 at Silang, Cavite, has since spread to various provinces in the country, and damaged more than of abacá plantations in 2002 alone. The university is working further to make it resistant to mosaic and abacá bract mosaic viruses. In July 2010, UPLB announced that the Leucinodes orbonalis-resistant Bacillus thuringiensis (Bt) eggplant variety that it had been developing with Cornell University and Mahyco was ready for commercialization. On 17 February 2011, Filipino and Indian Greenpeace activists trespassed UPLB's Bay research farm and uprooted two Bt eggplants and more than 100 non-genetically modified eggplants. The National Academy of Science and Technology and ranking UPLB officials condemned the incident, and have taken legal action. Biofuel research Pioneering efforts in biofuel research have been conducted at the university. Studies conducted in the 1930s found that gasoline with 15–20 percent ethanol, dubbed "gasanol", was more efficient than pure gasoline. Biofuel research in 2007 under the National Biofuel Program has considered new sources of biofuel, such as coconuts, Moringa oleifera, and sunflower seeds. Efforts have been concentrated on the Jatropha curcas due to its low maintenance and fast yield. Other fuel, such as coconut biofuel, were found to be too costly. Biofuel from Sorghum bicolor, Manihot esculenta crantz and Chlorella vulgaris are also being studied. Nanotechnology research UPLB's nanotechnology program focuses on research and innovation in agriculture, food,