3.3.1. Morphological Indicators

The results in (Figure 2) indicated that *Fusarium*-wilt hurt all vegetative pepper growth compared to healthy control. *F. oxysporum* minimized shoot length by 46.89%, root length by 48.45%, and the number of leaves by 45.07%, respectively. Regarding the effect of cyanobacteria, it was observed that infected plants treated with *D. muscorum, A. oryzae,* and *A. platensis* through different modes, i.e., soil and foliar spraying showed promising recovery. It was determined that *A. platensis* was the most effective cyanobacteria for recovering plant height by 70.64% and 69.53%, root lengths by 92.94% and 92.94%, and the number of leaves by 76.92% and 58.97% through the soil and foliar application, respectively.

**Figure 2.** Effect of cyanobacteria on morphological traits of the infected pepper plant with *Fusarium* wilt (T1-healthy control, T2-infected control, T3-infected plants treated with *D. muscorum* soil, T4 infected plants treated with *A. oryzae* soil, T5-infected plants treated with *A. platensis* soil, T6-infected plants treated with *D. muscorum* foliar spray, T7-infected plants treated with *A. oryzae* foliar spray and T8-infected plants treated with *A. platensis* foliar application.) (Data represent mean ± SD, n = 3), (a–d Letters revered to significant in statically analysis).

### 3.3.2. Photosynthetic Pigments

Results in (Figure 3) showed that chlorophyll a (Chl a) and b (Chl b) were highly inhibited in *Fusarium* infected pepper plants by 39.41% and 59.46%, respectively. On the other hand, the present study showed that the level of carotenoids in infected pepper plants increased compared to the healthy control. However, the application of cyanobacteria through the soil and foliar application to the infected plants significantly increased the level of carotenoids over the infected control plants. It was found that foliar and soil application of *A. platensis* was the most effective way to enhance infected plants' levels of Chl a, b (84.81% and 191.01%). On the other hand, *D. muscorum* foliar spraying was the most efficient method for increasing the carotenoids in infected plants (123.00%).
