Fig. 4
![Fig. 4](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs41938-021-00484-5/MediaObjects/41938_2021_484_Fig4_HTML.png)
a Nematode production (IJs ml−1) in larvae of Rhynchophorus ferrugineus treated with Bt-k (70 µg g−1), Beauveria bassiana (1 × 107 conidia ml−1) and Heterorhabditis bacteriophora (300 IJs ml−1) applied alone or in combination. Treatments followed by the same letter within each treatment are not significantly different; HSD test P ≤ 0.05 (Bt-k: Bacillus thuringiensis var. kurstaki, Bb: Beauveria bassiana, EPN: Heterorhabditis bacteriophora). b Nematode production (IJs ml−1) in adults of Rhynchophorus ferrugineus treated with Bt-k (70 µg g−1), Beauveria bassiana (1 × 107 conidia ml−1) and Heterorhabditis bacteriophora (300 IJs ml−1) applied alone or in combination. Treatments followed by the same letter within each treatment are not significantly different; HSD test P ≤ 0.05 (Bt-k: Bacillus thuringiensis var. kurstaki, Bb: Beauveria bassiana, EPN: Heterorhabditis bacteriophora)