On 13 June 1942, Wilcke claimed his first victory with JG 3 "Udet", shooting down a Lavochkin-Gorbunov-Gudkov LaGG-3 fighter for his 39th victory. He followed this with another LaGG-3 on 22 June, and a LaGG-3 and a Polikarpov R-5 reconnaissance bomber on 24 June 1942. On 3 July 1942, he claimed three Douglas Boston medium bombers, followed by two LaGG-3s and another Boston the next day. He became an "ace-in-a-day" again on 6 July, shooting down a Bell P-39 Airacobra, a LaGG-3, an R-5 and three Hurricanes. Three days later, he shot down two Ilyushin Il-2 Sturmovik ground-attack aircraft and, on 10 July, four more Bostons. The next day, he claimed another R-5 and two Mikoyan-Gurevich MiG-1 fighters. On 12 July, he again claimed an R-5 and two LaGG-3s before he shot down another LaGG-3 on 18 July. On 24 July he was credited with a Polikarpov I-153 biplane fighter and two days later two Hurricanes and two Pe-2s. On both 27 and 28 July he claimed victory over a LaGG-3, his last victories in July 1942.