The degree of plant immunity, if the plant shows 20% immunity against any infestation. This plant as a host 20% plant resistance. Good luck.

Dear Dr. Santhosh,

The term host plant resistance is commonly used in the context of interactions between plants and plant-feeding organisms (herbivores or phytophages). In this context, you can see host plant resistance (HPR) as the capacity of a plant to reduce damage by herbivores by plant traits that reduce the preference or performance of the herbivores (Panda & Khush 1995; Smith 2005; Leimu & Koricheva 2006; Kessler & Heil 2011), or that reduce the opportunity of herbivores to find a plant (part) (increased plant escape from herbivores) (Belsky et al. 1993; Boege & Marquis 2005). Reduction of preference (HPR by non-preference, avoidance or antixenosis) includes reduction of oviposition preference, of feeding preference but also of preference to use a plant as habitat or shelter. Reduction of performance (HPR by antibiosis) refers to reduction of growth, development or survival of herbivores when feeding from the plant. HPR by decreased findability is related to plant traits that decrease the probability of a plant or plant part to be detected by herbivores (cf. Plant apparency; see Feeny 1976; Kogan 1986; Endara & Coley 2011). HPR is a relative term, which considers damage reduction in resistant plants with reference to non-resistant plants (plants without the specific resistance traits) (Rausher 1992; Smith 2005).

If you would like a different approach to the term "host plant resistance", it might be helpful if you could reformulate or clarify your original question.

Best wishes,

Karsten

Host-plant resistance entails the intentional use of resistant crop varieties, alone or in combination with other tactics, to reduce the impact of herbivores on crop yield or quality.