[Crawl-Date: 2026-04-22]
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[URL: https://bio-greenlab.com/en/blog/chitinases-against-phytopathogenic-nematodes]
---
title: Chitinases against phytopathogenic nematodes | Bio-Green Lab
description: How chitinase enzymes degrade the eggshell of eggs and juveniles of phytopathogenic nematodes to protect crops.
url: https://bio-greenlab.com/en/blog/chitinases-against-phytopathogenic-nematodes
canonical: https://bio-greenlab.com/en/blog/chitinases-against-phytopathogenic-nematodes
og_title: Chitinases against phytopathogenic nematodes | Bio-Green Lab
og_description: How chitinase enzymes degrade the eggshell of eggs and juveniles of phytopathogenic nematodes to protect crops.
og_image: https://bio-greenlab.com/og-default.png
twitter_card: summary_large_image
twitter_image: https://bio-greenlab.com/og-default.png
---

# Chitinases against phytopathogenic nematodes | Bio-Green Lab
> How chitinase enzymes degrade the eggshell of eggs and juveniles of phytopathogenic nematodes to protect crops.

---

[![Chitinases for agriculture — Bio-Green Lab](https://bio-greenlab.com/assets/campo-abierto-Be3u4_lc.jpg) ](https://bio-greenlab.com/agricultura-protegida)

## Why the nematode problem is large and particularly relevant in Mexico

Soil-dwelling plant-parasitic nematodes are rarely "seen", but they can define the economic outcome of a planting, especially in vegetables and intensive systems with repeated cycles. Globally, economic losses associated with plant-parasitic nematodes have been estimated at around **USD 173 billion per year**, placing them as a silent but massive risk for food security and agricultural profitability.

USD 173B

Annual global losses from nematodes

3,000+

Plant species affected by Meloidogyne

68%

Potential yield loss in tomato

Within that universe, root-knot nematodes of the genus *Meloidogyne* stand out for two reasons: (1) their extremely wide host range and (2) their ability to multiply rapidly once established in a field. A Mexican study on tomato in Sinaloa summarizes a key fact: *Meloidogyne* can affect more than 3,000 plant species, and infection is recognized by the formation of root galls.

In Mexican horticultural systems, the challenge is not only "having or not having" *Meloidogyne*, but which species is present. In Sinaloa, sampling of 160 fields (open field, shade mesh and greenhouse, across several cycles) found a marked dominance of ***M. enterolobii* (88%)**, with minor presence of *M. incognita* (10%) and *M. arenaria* (2%). This matters because *M. enterolobii* has been associated with scenarios where classical strategies (including varietal resistance) may fail more frequently.
**Regulatory context:** In Mexico, in 2025 a presidential decree was published banning 35 pesticides and defining that the prohibition covers production, formulation, marketing, use and final disposal in national territory. The list includes molecules historically used in intensive agriculture (for example aldicarb and carbofuran, among others).
In this scenario, "biological precision" technologies — such as using specific enzymes in the soil — have gained attention. Among them, chitinases stand out because they target a very particular component of the biology of many soil organisms: chitin.

## How root-knot nematodes cause damage and why they are so difficult to control

Damage from *Meloidogyne* is not limited to "ugly roots". The mechanism is more sophisticated and explains why traditional chemical control often ends in a spiral (more applications, less efficacy, more regulatory pressure).

After hatching, the second-stage juvenile (J2) is the infective phase: it moves through the soil, penetrates the root and migrates toward vascular tissues. There it induces a permanent feeding site composed of **giant cells**, which are plant cells reprogrammed to function as a metabolic "sink" feeding the nematode while it develops.

![Microscopy of Meloidogyne J2 juveniles](https://bio-greenlab.com/assets/nematodo-microscopio-juveniles-BSNeJsdr.png)
Microscopy of second-stage juveniles (J2) of Meloidogyne — the infective phase that penetrates roots and establishes feeding sites.
The visible result is the gall, a hypertrophy/hyperplasia of the tissue around the feeding site. This anatomical change alters water and nutrient dynamics, and usually translates into reduced vigor, chlorosis, wilting during heat hours and yield drops (besides predisposing to secondary infections by damaging the root tissue).

In tomato, yield losses of up to **68%** have been reported associated with root-knot nematodes, a range that helps to size up why this issue is critical in high-value horticulture.

The management trap is that, once a high population is established in a field, reducing it to "non-damaging levels" becomes difficult: symptoms can be confused with abiotic stress, action arrives late, and nematode reproduction does the rest.

## Chitin: the real target of chitinases and what is worth clarifying

A common idea in popular science is that "the nematode cuticle is made of chitin". In reality, the most solid biochemical evidence indicates that the cuticle (the nematode's outer "skin") is a complex matrix composed mainly of **collagen and associated proteins**, and that collagens are dominant structural components.

So why does it make sense to talk about chitin to control nematodes?
Because chitin is especially relevant in the **egg**. Nematode eggs have well-defined layers; one of them is the **chitinous layer**, described as a generally thick, structural layer composed of chitin fibers associated with proteins, with rigidity and embryo-protection functions.
![Microscopy of nematode eggs showing the chitinous layer](https://bio-greenlab.com/assets/nematodo-microscopio-huevos-DZUXN4x4.png)
Microscopy of nematode eggs — the chitinous layer is the main target of the enzymatic action of chitinases.
This changes the right way to tell the story: chitinase is, above all, a tool to attack the bottleneck **"egg → hatching → infective J2"**, rather than a "magic bullet" against the outer cuticle by itself. In practice, many biological solutions work as packages (chitinases + proteases + metabolites + microbial competition), and their efficacy is explained by several pieces acting at the same time.

Furthermore, chitin is an attractive target due to its biological selectivity: it is a major component of fungal cell walls and appears in various invertebrates; and in agriculture it has been known for years that plants produce chitinases as part of their defense system (pathogenesis-related proteins) against organisms containing chitin.

## Chitinases and biological control: what the data show with concrete figures

Field-useful research is not limited to "yes, it kills on a plate". The most valuable thing is when there are numbers under conditions close to production: greenhouse, field, combination of practices. On that ground, there are three main routes linked to chitin/chitinases.
## Hatching inhibition and reduction of the infective phase

In the logic of *Meloidogyne*, reducing available J2 is key because J2 is the phase that initiates infection. A biocontrol study with *Streptomyces rubrogriseus* (isolated from *Meloidogyne* eggs) reported in the laboratory **97.0% J2 mortality** and more than 50% hatching inhibition, showing strong potential of direct action on critical phases of the cycle.

97%

J2 mortality in laboratory (S. rubrogriseus)

87.1%

Reduction of gall index (biocontrol + biofumigation)

This same work is valuable because it did not stay in the laboratory: in the field, application of the microorganism (drench with spore broth) reduced the gall index and J2 density at 90 days post-transplant; and, when combined with biofumigation with cabbage residues, the reduction reached **87.1%** (gall index) and **91.0%** (J2 density), with an increase of **16.1% in tomato yield**.

Although here "purified chitinase" is not measured as a single factor, the context is consistent with chitinolytic biocontrol: the isolate came from eggs, parasitism is observed, and the effect is expressed precisely on eggs/J2 (the stages where chitin is most relevant).
## Chitin amendments that "activate" suppressive soils

A different strategy — very pertinent for growers — is not to apply purified enzyme, but to modify the soil to favor antagonistic microorganisms and chitinolytic processes.
A greenhouse trial evaluated bovine manure vermicompost and its enrichment with chitin. The treatment of **vermicompost + 50% chitin** achieved a reproduction factor (RF) of **3.76**, while the control reached **93.20**. That is: a drastic reduction of the nematode's ability to "multiply" in the system.
Beyond the number, this kind of result suggests a "hostile environment" mechanism for the nematode: physical-chemical changes in the soil, compounds released during decomposition and an increase in antagonistic microorganisms (including those that produce extracellular enzymes such as chitinases).
## Biocontrol with *Trichoderma* and the enzymatic piece

In Mexico there is applied evidence that connects with real production systems, especially in the southeast. A study in Yucatán evaluated filtrates of 20 native strains of *Trichoderma* against J2 of *Meloidogyne incognita*. In in vitro tests, several strains caused **74.54% to 100% J2 mortality** at 24–48 hours. In greenhouse, some strains reduced egg production by 50% and decreased the number of females (reductions reported of 47% vs control for certain strains), showing impact not only in "killing" but in "cutting reproduction".

In parallel, recent reviews have documented cases where chitinase-rich fermentation broths from *Trichoderma koningiopsis* reach lethal rates close to **90.4%** against root-knot nematode juveniles (depending on species and conditions), supporting the hypothesis that the enzymatic fraction contributes importantly to the observed nematicidal effect.
**Practical conclusion:** Biological routes based on chitinolytic microorganisms and/or on inducing chitinolytic activity already show competitive figures in certain scenarios, especially when integrated with other practices (biofumigation, amendments and integrated management).
![](https://bio-greenlab.com/assets/field-application-BEI-okug.jpg)

"From lab to field: the evidence already shows competitive figures in real production scenarios"

## From lab to field: decision guide to implement chitin/chitinase strategies in Mexico

This topic becomes useful when it is grounded in management decisions: when, where and what to combine with. Based on the evidence (and on how the nematode cycle works), there are five practical principles.

1
## Preventive and early

Management should be preventive and early, because J2 is the trigger of infection and because population growth can become exponential if left to advance.

2
### Reduce pressure, do not eradicate

It is best to think about 'reducing pressure' rather than 'eradicating': even studies with high results report significant reductions and yield improvements, not 'zero nematodes'.

3
### Identify the species

Species identification can change the strategy. In Sinaloa tomato, the dominance of M. enterolobii (88%) is a warning because the performance of resistance may not be the same.

4
### Amendments in protected horticulture

Systems where the crop is repeated and favorable humidity/temperature is maintained tend to sustain higher populations; that is why amendments (chitin + compost/vermicompost) and rotations have agronomic logic.

5
### Layered strategies

Chitin/chitinase strategies tend to work better as layers: amendments for suppressive soils, microbial biocontrol (Trichoderma, actinobacteria) and biofumigation as reinforcement.

In terms of "what to expect", documented results range from partial reductions (e.g., >50% hatching inhibition under specific conditions) to high control scenarios (e.g., 87–91% when integrating practices and yield increases).

## Safety, regulation and market opportunity: why this fits with the Mexican transition to bioinputs

Regulatory and commercial trends push toward lower-risk inputs. The 2025 Mexican decree on 35 banned pesticides is evidence of a transition that, in practice, forces growers and formulators to broaden the toolbox, especially in soil pests where historical dependence on highly toxic molecules was high.

In the Mexican regulatory framework, it is important to understand that inputs (including biologicals) do not operate in a vacuum. In Mexico, pesticide regulation involves three federal agencies: health, environment and agricultural biological efficacy. Sanitary registration of pesticides is issued by the Federal Commission for the Protection against Sanitary Risks in coordination with the Secretariat of Environment and Natural Resources and the Secretariat of Agriculture and Rural Development, and the role of the National Service for Agrifood Health, Safety and Quality in biological control programs is also mentioned.

This has direct implications for chitinases and related formulations:

- If **chitinase is considered as an active ingredient/biomolecule**, consistency (enzymatic activity, stability, compatibilities) becomes as important as the "concept". In applied research, specific conditions and yields of chitinase production in solid-state fermentation for *Trichoderma koningiopsis* are reported, showing that production engineering is central to making this a reliable agricultural input.
- If **chitin is used as an amendment**, the logic is more "ecological": inducing chitinolytic activity and changes in the soil microbiome, with evidence of strong impacts on nematode reproduction.

![Researcher in biotechnology laboratory](https://bio-greenlab.com/assets/scientist-reactor-C4H0IDnc.jpg)
Production engineering — enzymatic activity, purity and stability — is central to converting research into a reliable agricultural bioinput.
Finally, if the goal is to "orient it to Mexico" with productive data, two scales are worth looking at: national and state. In tomato in Sinaloa, production/export figures were documented for specific seasons (for example, close to 1 million tons produced in one season and exports quantified with economic value), which explains why soil nematodes have macro impact on value chains. On the other hand, in the State of Mexico there are official state data reporting, for 2024, area, production and value of tomato at the municipal and total state level (for example, 145,683.09 tons and 1,215,226.83 thousand pesos as state total), useful to size the regional importance of the crop and the potential cost of losing productivity to soil pathogens.
## Disclosure note and responsible use

This article is for scientific outreach and focuses on mechanisms and published evidence. Field implementation depends on local diagnosis (population density, species, field history), climate, production system and compliance with the regulation applicable to phytosanitary inputs in Mexico.
### Laboratory note

**Bio Green Labs** is a Mexican company oriented to the production and scaling of enzymes such as chitinase; any commercial use or integration in formulations must be based on technical specifications (activity, purity, stability) and on what the current regulatory framework allows.

[![Chitinases for Agriculture and Poultry — Bio-Green Lab](https://bio-greenlab.com/assets/quitinasas-avicultura-horizontal-B3iBmtF1.jpg) ](https://bio-greenlab.com/producto)

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* [The nematode problem](#problema)
* [How nematodes cause damage](#dano)
* [Chitin: the real target](#quitina)
* [Data with concrete figures](#datos)
* [Decision guide](#guia)
* [Regulation and market](#regulacion)
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