Peter M Hirst

Facts for Fancy Fruit Editor & Professor of Horticulture
Department of Horticulture and Landscape Architecture
Area(s) of Interest: Commercial Tree Fruit Production

198 articles by this author

Article List

A new Monsanto-backed company is on the verge of producing the first fruit made with a blockbuster gene-editing tool that could revolutionize agriculture In a move aimed at securing its future, Monsanto has invested $125 million in a gene-editing startup called Pairwise. The alliance could tee up Monsanto, long known for its controversial dealings with…Read more about The First Fruit Made with a Blockbuster Gene-editing Tool[Read More]


The New York Times reports China has proposed countermeasures to a proposed $60 billion in tariffs from the U.S. on Chinese-made products. The Chinese Ministry of Commerce issued the threat in an online statement. American goods including nuts, wine, and fresh fruit would be subject to 15% tariffs. The Times reports these proposed tariffs in…Read more about China Proposes 15% Tariff on Fresh Fruit, Wine[Read More]


Of course, we all hope for a late spring to help avoid the risk of damage from late spring frosts. But when the temperature warms up then turns cold again, it leaves us in a real bind. The warm temperatures push tree development, then we want the warmer conditions for good pollinating weather. When we…Read more about Increasing Apple Fruit Set in Cold Springs[Read More]


So far it has been a cool spring, that in the northern half of the state has helped hold back bud development. As we can see from Figure 1, in Lafayette we have only accumulated 25 growing Degree Days (GDD), and most of these were the result of two warm days (54 and 63 F)…Read more about Spring Temperatures[Read More]


It has been a cool spring so far and most fruit crops are still relatively dormant in the Lafayette area. Early grapes are just at bud swell, red raspberries are also showing signs of growth, sweet cherry buds are swelling, and early apples are at silver tip. Fruit trees in Lafayette remain dormant, however are…Read more about Crop Conditions[Read More]


May 7, 2018 Purdue Wine Grape Team “From Grape to Glass” Byler Lane Winery 5858 County Road 35, Auburn, IN 46706 Contact Jill Blume blume@purdue.edu June 26, 2018 Indiana Hort Society Summer Field Day Garwood Orchard, LaPorte, IN Contact Lori Jolly-Brown ljollybr@ purdue.edu October 17, 2018 Indiana Flower Growers Conference Daniel Turf Center Contact Lori Jolly-Brown…Read more about Upcoming Events[Read More]



Apple harvest is winding down with late varieties such as GoldRush and Pink Lady being harvested. Quality has continued to be good, although some stem-end cracking has shown up on some cultivars. We have continued to run about a week early throughout the season.


Indiana Flower Growers Association Conference October 10, 2017 Daniel Turf Center, Purdue University West Lafayette, IN Contact Lori Jolly-Brown @ljollybr@purdue.edu Indiana Horticultural Congress February 13-15, 2018 Indianapolis Marriott East Indianapolis, IN Contact Lori Jolly-Brown @ljollybr@purdue.edu Visit www.inhortcongress.org for more details


Apple harvest continues and apples are still running about a week ahead of normal. A higher than usual amount of stem-end cracking is showing up. Fruit showing these cracks should be sold first and are not suitable for long-term storage. Grape harvest is winding down with only the latest varieties left. Primocane blackberry and raspberry…Read more about Crop Conditions[Read More]