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Acta Horticulturae Sinica ›› 2026, Vol. 53 ›› Issue (3): 845-856.doi: 10.16420/j.issn.0513-353x.2024-1033

• Plant Protection • Previous Articles     Next Articles

Effects of Trichoderma harzianum Combined with Bacillus megaterium on Melon Fusarium Wilt and the Growth and Yield of Melon

LIU Yanan1, WEN Haibin1, HAN Ying1, DONG Jia1, GUO Yanjie3, MAO Xiaoxi3, LI Qingmei1, ZHAO Hongbo2,**(), LU Xiujun1,**()   

  1. 1 College of Plant Protection,Hebei Agricultural University,Baoding,Hebei 071000,China
    2 Langfang Agriculture and Rural Bureau,Langfang,Hebei 065000,China
    3 College of Resources and Environment Science,Hebei Agricultural University,Baoding,Hebei 071000,China
  • Received:2025-07-28 Revised:2025-12-10 Online:2026-03-20 Published:2026-03-20
  • Contact: ZHAO Hongbo, LU Xiujun

Abstract:

To explore the effects of Trichoderma harzianum(TH)in combination with Bacillus megaterium(BM)on the control of melon Fusarium wilt and yield. Pot and field experiments were established to explore the effects of TH + BM on Fusarium wilt incidence,melon plant growth and yield,and the dominant genera abundance in melon soils. Meanwhile,the number of Fusarium gene copies was analyzed through qPCR. The results showed that TH and BM were compatible. Compared with the control,the incidence rate and disease index of melon wilt treated with TH + BM were decreased by 75.00% and 85.19% in the pot experiment,respectively(P < 0.05). The field experiment showed that the heights and stem diameters of melon plants were increased by 4.88% and 4.73% after planted 50 d respectively(P < 0.05). The single fruit weight increased 6.33% within TH + BM treatment compared to the control. At fungal genus level,compared to the control,TH + BM treatment significantly decreased the relative abundances of F. and MortierellaP < 0.05),while increased the relative abundance of Microascus and Beauveria(P < 0.05). At bacterial genus level,compared to the control,TH + BM treatment increased the relative abundances of BacillusPseudomonasOerskovia,and HyphomicrobiumP < 0.05). The correlation analysis showed that the relative abundance of F. was significantly positively correlated with the F. wilt incidence of melon,and significantly negatively correlated with single fruit weight. When melon planted 90 d,the number of FOM copies within TH,BM,and TH + BM treatments were 5.63 × 104,1.01 × 105,4.82 × 104 copies · g-1,accounting for 16.09%,28.86%,and 13.77% of the control(3.50 × 105 copies · g-1),significant different from the control,respectively(P < 0.05). In summary,T. harzianum in combination with B. megaterium improved the structure of microbial community in melon continuously cropping soils,reduce the incidence of melon Fusarium wilt,and increased melon yield.

Key words: melon, biological control, soil microorganisms, Trichoderma harzianum, Bacillus megaterium, Fusarium wilt